Cool. I like his face alot, and he's got a nice, powerful look to him.
The close arm looks much larger than the far one, as does the hand.
He's leaning back.
I think his outstretched hand should be more open. Think about if he were in a fight: Someone comes at him and he tries to punch their arm away? Nah, grabbing their arm would make much more sense. He looks like a grappler anywho.
His legs need some motion.
Where's his elbow?
Are you limiting yourself to 2 frames, or do you intend on adding more?
The wrinkles could use some more work.