i love the colors and the rendering. is your first name jaques-louis?
i think the closer hand feels too small, mostly because not only is the thumb not visible, but there is nothing to indicate that it is being hidden, either, other than the fact that they eye wants it to be there
not much else to say before its more finished and defined. I asume that you are going to refine the facial geometries? (if not i think you should! - it looks like a cutout atm)