For some reason the green makes it look much smoother than the grey. Maybe it's a timing thing different in the animations , maybe it's just the cleaned up frames*shrugs* (You know better than I, what am i ramlbing about?). I personally think these 6 frames should be fine, but I'm no expert in animation as of now. Proportions look fine, as well, though, you're right, that head didn't translate (I thought it was a weird neck and not a chin at first). Another thing is, though the angle makes it hard to tell for sure, his right arm seems not to move forward very much. It looks good, though, so don't sweat it if you think it's fine.