Very nice shot, love those lightbeams!
But i feel like the griund could be a bit darker for the water to look deeper...

I agree with Marc. The ground is too light. A gradient filter in LR or PS would solve that. Also, these shots look even better when the photog is below the subject. The added perspective makes the depth look greater and you dont get so much of the fisheye effect of the surface.

Really good idea and still like the shot