Oh, that is so adorable, I love the dolphin's expression! ^^ The anatomy on both the dolphin and the fish are pretty good, but I do have some (hopefully) helpful critiques on the dolphin. One, his lower jaw is to short - with solphins, the lower jaw is actually just a tiny bit longer than the upper. Two, his tail isn't bending enough for the flukes, which should be perpendicular to the back, to be in a natural-looking position; they look like they're in a more fishlike, parallel with the back position. However, that's something that just about anyone who's ever drawn a cetacean has had trouble with - those flukes are really hard to get right no matter what the angle! Well, keep drawing! ^^ This is an adorable pic, as I said. ^_^