the texture/bump/normal map on that crab, so good! (i first thought it was a painting)
the fish looks a bit flat how ever compered with everything around him, but it makes contrast too, he dose look less scary.
i donĀ“t know if the fish knows that the crab is there, or if his minding his own business. maybe it would help to moving his fish eyes away from the crab, when his steering forward like he is it its hard for me to know what his thinking on his end. making him look more up his right, can make him look like he dosent not know the crab is there. (making him smile could help too, or giving him a bigger frown would too so he looks kinda shocked)
also being able to see his fish scale tho would be interesting.
love that crab tho. everything else like the walls and the rocks looks great!