Light source on the hand is from upper right. Shadows should be cast accordingly. You might want to soften (feather or blur) the hard edges of the hand, too.

Awesome concept author! Liquify works great to create the melt effect, you can also copy the bottom part of the watch of the melted section (copy) and perspective it so that it looks like it's moving toward you and on the surface of the wood instead of just touching the surface. Tricky, but it adds to the effect. Not necessary just a suggestion. Good luck.

liquid metal Thats nice

This is really cool!
I agree with CMYK46. IMO the drop shadow tool will diminish a great pic. Paint your shadows..you will have more control of where they lie and look more natural. For the hard hand edge, just make a second hand layer, Gaussian blur bottom layer, (about 30%). then take your eraser (50%) and erase only bits of the edges creating foreshortening. Same with table edge. I love Dali btw

I agree with all of you guys, But time is not always on my side.
I did not change the hand with filtering, I just took a new photo of the hand with light on top of it. Thanx for the suggestions.