Sentinels head is better now. You have some flickering pixels on left side of his mouth, that flicker along with lights, I don't suppose that this was left on purpose. Also do you need those low lights (near the ground) on every pillar. Maybe they would have more impact if they aren't so symmetrically positioned. Try to skip some of them.
About Wolverine portrait, I said that it's not the same costume, and I gave you the reference to suggest his facial expression not entire look. Maybe you can make couple profiles, depending on his health level. I know it's not very original idea, but it could be very interesting detail.
I like new stance, next time you should post it along with background, and it would be interesting to see still animation for it.
