I dont mean to be the judging type, because your stuff is honestly good, and I am no where near your talent, so forgive me for this comment.
All of you hands are brilliantly done, but the two hands in the middle, when I first looked; I noticed nothing, but then...
The index fingers, they lack definition. You can tell its a hand, easily. But you can't see the Phalanges as easily as the rest. On the one pointing to the left, the knuckles of the phalanx are missing, and as are the ones on the finger pointing up.
I dont know, it just doesnt fit in with the amazing-ness of the rest around them
Good. Cause I dont like firey criticisim myself. It hurts the soul. But, You just got to get back up and move on. Sometimes, those little nastys help you to be not only a better artist, but a better person.
Though, I don't like the scorches they leave. Nasty.