How to Draw Fish in a Fish Tank

To all the fish lovers out there: here's a brief guide on how to draw them in their little home! :)

Steps

1
To start, draw a rectangle. Make the a line twice as long as the b line. Click on images to enlarge them.
2
Add the c, d, c' , c and d' lines to make it a cuboid. For other fish tank shapes, see Tips.

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3
Draw the bottom and the lid (pic (a), red lines). They should overlap with the edges of the cuboid, and their own vertical edges (green) should be parallel. If you desire an open tank, draw pic (b) and be sure to add the e line so the fish tank has depth.
4
Erase the original lines and color the bottom and the edges of the lid black (most tanks' lids are transparent on top so the fish can be seen, but feel free to darken it if you wish).
5
Sketch your fish; draw as many as you want. Note that the water level is rarely seen from this perspective, that's why we haven't drawn it. Sketch a few rocks and shells at the bottom.
6
Color your drawing and add in some water grass. Draw six short, diagonal lines and two white ones representing light reflection on the fish tank to add the "glass effect".
7
Add background, shade it and you're done!