Very well made, i like the scale, the choice of colors is very good 
I see what you mean about the AA, i'll try do something about it.
Thats a nice shark! I do agree on the comment from Spherical about the AA though, you already have the colors needed in your palette!
Also some AA on the transition of white to blue would make it look less jagged.
It looks quite nice, but for a shark he's not got much teeth...
do you know sharks do not have scales, all his skin is made up of teeth? that explains why they have 3 rows of teeth in their mouth! fun isnt it! :D