Start with a straightforward rectangle for the tank outline
The easiest way to draw an aquarium is to begin with the shape of the tank itself. Draw a rectangle on your paper — this will be the front view of your aquarium glass. Make the rectangle taller than it is wide if you want a standard upright tank, or wider than it is tall for a long, shallow one. Don't worry about making it perfectly straight; a ruler helps, but freehand works fine too.
Once you have your basic rectangle, add a second line inside it, about a quarter-inch away from the first. This inner line represents the thickness of the glass and makes the tank look three-dimensional. You can also add a thin rectangle at the bottom inside the tank — this will be the base or substrate where plants and decorations sit.
Key Takeaways
- Start by drawing a rectangle for the tank outline, then add an inner line to show the glass thickness and make it look solid.
- Fill the bottom third of the tank with wavy horizontal lines to represent water, leaving the top third mostly empty to show the air space above.
- Add plants, rocks, and decorations inside the tank using straightforward shapes — circles for rocks, curved lines for plants, and rectangles for ornaments.
- Draw fish using an oval body with a triangle tail, then add fins, eyes, and stripes or spots to make them look realistic.
- Shade your drawing with pencil or color to add depth, making the water slightly darker and the glass edges lighter.
Draw water with straightforward wavy lines
Water in an aquarium drawing doesn't need to be complicated. Inside your tank rectangle, draw horizontal wavy lines across the middle and lower sections. Start at the bottom with one wavy line, then add another above it, and another, spacing them about half an inch apart. These lines suggest the surface of the water and the depth below.
Leave the top portion of the tank mostly empty — this is the air space above the waterline. You can add a thin wavy line near the top to show where the water surface meets the air. The empty space at the top makes it clear that the tank is not completely full, which looks more natural than filling every inch with water lines.
Add plants and decorations with basic shapes
Plants and rocks are what make an aquarium look interesting. For plants, draw curved or wavy vertical lines that start from the bottom and reach upward. You can make them look leafy by adding small oval shapes along the lines, or keep them straightforward as just flowing curves. Aquatic plants don't have to look exactly like real ones — stylized versions work well in drawings.
Rocks and decorations are even simpler. Draw circles or irregular rounded shapes for rocks scattered across the bottom. For a castle, treasure chest, or other ornament, use basic rectangles and triangles. A small rectangle with a triangle on top becomes a castle tower. Don't fill every space — leaving some open water makes the tank feel less crowded and easier to read.
Draw fish with an oval body and triangle tail
Fish are the main attraction in an aquarium drawing. Start with an oval or ellipse for the body — this is the simplest fish shape. Add a triangle pointing backward from the rear of the oval for the tail fin. Now your basic fish outline is done.
To make the fish look more detailed, add smaller triangles or fins along the top and bottom of the body. Draw a small circle near the front of the head for the eye, and a tiny curved line for the mouth. You can add stripes, spots, or scales by drawing lines or dots across the body. Vary the size and direction of your fish so they look like they are swimming in different directions — some facing left, some right, some angled upward.
Use shading and color to show depth
A flat drawing becomes three-dimensional when you add shading. Use a pencil to lightly shade the water areas with horizontal strokes, making the shading slightly darker toward the bottom of the tank. This creates the sense that water gets deeper and darker as you go down. Leave the top of the water lighter to show where light enters from above.
Shade the glass edges of the tank with light pencil lines to make them stand out from the water inside. If you are using colored pencils or markers, light blue or cyan works well for water, green for plants, and gray or brown for rocks. Color the fish in bright colors — reds, yellows, oranges, and blues stand out nicely against the blue water. You don't need to color every part; leaving some areas white or lightly shaded gives the drawing a sketchy, artistic feel.
Common mistakes to avoid
The most common mistake is making the tank too small relative to the fish and decorations. Your tank outline should be large enough that fish, plants, and rocks fit comfortably inside without looking cramped. Another mistake is drawing the water lines too straight and parallel — real water has movement and variation, so make your wavy lines uneven and at different heights.
Avoid filling every inch of the tank with details. Empty space is just as important as filled space in a drawing. If you draw plants, rocks, and fish everywhere, the eye has nowhere to rest and the drawing looks cluttered. Leave some clear water visible so the viewer can see into the tank. Finally, don't make all your fish the same size or facing the same direction — variety makes the drawing more interesting and realistic.
Frequently Asked Questions
What materials do I need to draw an aquarium?
Paper, a pencil, and an eraser are all you need to start. A ruler helps you draw straight tank edges, but it is not required. If you want to add color, colored pencils, markers, or watercolors all work well. Pencil shading alone creates a nice effect without any color at all.
How do I make my fish look more realistic?
Add details like scales, fins, and eyes. Draw small curved lines across the body to suggest scales, make the fins more detailed with internal lines, and shade one side of the fish darker than the other to show which way light is hitting it. Study a photo of a real fish for a few minutes before drawing to get the proportions right.
Should I draw the aquarium from the front or the side?
The front view (looking straight at the glass) is easiest and most common. A side view is harder because you have to show depth and perspective. Start with the front view, and once you are comfortable, try drawing the tank at an angle to make it look more three-dimensional.
Can I draw an aquarium with just a pencil, or do I need color?
Pencil alone works perfectly. Use light and dark shading to show the water, glass, and depth. Many professional drawings are done entirely in pencil or ink. Color makes it easier to show what is water and what is a fish, but it is not necessary.
How do I draw a realistic water surface?
Draw a slightly thicker wavy line at the top of the water to represent the surface. Add a few small ripples or waves along that line using quick, curved strokes. Shade just below the surface slightly darker to show that light reflects off the water surface. Keep it straightforward — a few wavy lines suggest water better than trying to draw every ripple.