Very cool idea, but plagued with continuity/scale errors.
Shadow underneath c4d shouldn't be entirely crisp, it would blur out according to distance from the ground, so the right side of the shadow would be sharp, but progressively blurry towards the left.
The way the shadow on the c4d is being projected it has a single light source directly or nearly directly above it, which would mean the fishes shadow would be closer to us, or further down depending on how you look at it. Also due to that the fishes shadow wouldnt touch the platform.
The platform the people (I think its people) are walking on seems very pasted in to me, and it doesnt look like its scaling down enough to imply distance considering close to us are these giant fish. Proportionally it doesnt seem to fit.
Uber lightsource doesnt match your shadows and an alien ufo has just finished beaming up a cow from the pasture. (hehe j/k, upper left corner)
As always, with sincere respect and
