The way that his arms are animating, the way they're hitting the ground, is off.
Maybe there needs to be more followthrough when they swing back? Is he actually pushing up with his arms, like a gorilla, or are they supposed to just be swinging? Right now, it looks like an animation of your character walking backwards. The arms just seem odd in general - are the elbow joints supposed to be reversed? Are they tentacles?
Everything else looks great.. the head bobbing side to side as he walks looks perfect.

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