Arm straightens out too much in the forward swing. Like he's reaching for something. The animation as a whole is lacking a nice fluid pendulum effect, and, as a result he looks like he's stomping. Looks like the foot is constantly perpendicular to the leg, which is unnatural. Ankles like to flex, too, ya know? Baccaman made an
awesome post I think may be pertinent.
He's lacking an ass. His shoulder goes way too far down his arm. Not a fan of the huge eyes. His back-of-head is lacking in much mass.
I would choose a much less angry face for a base character. Not everyone likes to play the pissed off at the world dude. In the walking animations, his head is facing too much towards the screen. He'd get a cramp walking around like that for a long time.
Oh, you posted while I was typing. Hold up...
The new face is an improvement, much, but he still looks a bit bored.
He needs a chin, I think. his mouth just goes like "
-/"
Still has no back-of-head.
Thick neck. Seems like it's a pixel too far left.
Thumb is...well, if you're going to do mitten-style hands, the "fingerspace" should be longer, otherwise it looks like he's just giving a thumbs-up all the time. This is on the back-swing, btw.
The crotch and consequentially the body are bobbing at the wrong times - when the leg is perpendicular to the ground is when he should be his tallest, when they are extended the shortest.
He's missing a far shoulder.
Don't be scared to show a little back.
When the near arm is extended forward, the chest seems ridiculously non-existent.
A little head rotation? Headtation?