Thank you for the feedback, it would probably look better if I had the light coming from one of the sides.

Crabulous! And welcome to PJ.

Something to think about here is figuring out how to "break" the symmetry on a piece like this - right now it's obvious that the left half of the crab is copypasted and flipped from the right half of the crab, which isn't necessarily bad, but there are ways to make that mirroring less obvious to the piece's benefit - most easily, keeping the outlines more or less the same but varying the shading or texture