I definitely agree with what Tetu mentioned about the tree appearing to be hovering over the hands. In your final, be sure to add some further roots / dirt to make it seem like it's actually growing from the hands.
The idea of having some of the dirt falling between the fingers is a great idea! As some of the others have mentioned, blending will be the key to success. Be a little careful with the shadowing as well - it currently needs a bit of work.
I'm really looking forward to updates and the final!
