This is very cool. I love egyptian archetypes, so this is an immediate fav.

I get the feeling that the prince's back is not strictly a side-view or profile, but rather a 3/4 perspective. That is, the angle is not 180 degs but rather something like 120 degs. However, your line art of his back doesn't show that atm, and makes it look somewhat off-kilter.

This is something that won't take a complete redraw to remedy. All you need to redraw are the line-art for the back (which is zero atm), and redo the coloring for the back.

If a complete redraw is warranted, I'd also change the orientation of the left arm. It's exactly the same orientation as the right arm - a strict 180 degs perspective. It's not as dynamic and also the human body doesn't work that way.

Edit: Actually, leave the left arm alone and change the right arm. Much easier and accomplishes the same thing.

I like the lower extremities. Evokes a Greek statue feeling, which is appropriate for this piece.