The fingers might look a WHOLE lot better with a detailed texture map on the palm.  With a good bump or displacement map,it'll kick butt.

The "bottom" of the thumb should be closer to the center of the hand.  It's at an angle, so I can't really tell.  The IN side of the bulge formed by the tensing thumb muscle starts about at the center of the base of the hand.  The after looks closer to the target, but I can't really tell at this angle.

You are definitely on the right track,now!

I cannot save the world. Only my little piece of it. If we all act together, we can save the world.--Nelson Mandela
An  inconsistent hobgoblin is the fool of little minds
Taking "Just do it" to a whole new level!