Nice ocean floor! Looks very like underwater sand, and the lighting's great, too. I don't know if I care for the color or surface of the water, but have no suggestions for improving them so I should shut up. :P It seems a bit crowded in the dolphin/whale thingy area. Maybe you could move it back or angle it or alter the pose? Looks like there's some interesting structure behind it, but the creature blocks it all out. Just my shooting my mouth off. Great work for a new user!