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The back leg is further away than the front leg, therefore it looks a bit shorter. Sorry, I'm not seeing the flattened face, though. As for the movement, it is, after all, a limited 4-frame animation. Thanks for the comments! 
The back and forward is very good, but the two from the side is not that impressive. The face looks flattned and the movement are a bit weird , the legs do not have the same length?
Good job with the FW and BW though :)
You know, for the millions of examples of similar stuff that's around, these are damned good.
I don't think the perspective is deep enough for you to shorten the leg in walk frame - only crit.