I think the sea creature needs eyes, especially if the figures are meant to be looking at each other. I don't know if those three round bits are meant to be eyes, they are in a strange place if they are and look more like gills to me. The glass of the tank should also carry reflections.
As for the second piece, the branch looks too straight and artificial, especially growing out at a right angle from the trunk, and the women seem oddly crammed together.