The walk and nods are good. Altho the shoulders in the sideview walk could stand to move front to back - like you've got them doing in the front and back views.
Kneeling: I'm not sure why in the front view you've got the feet spreading apart.
Its always a good idea to act stuff out, as well as sketch it, before trying to animate it in sprite form. When I act it out, my front foot stays put and the backone slides further back, and its a natural reaction to put my arm on my knee.http://www.alisachristopher.us/resources/kneel.png
In the back view, you've got his leg getting wider as it gets shorter, giving him the appearance of not having any bones. Instead you'll want to use curves to denote foreshortening (again, sketch it out before spriting it)
And the ears on the back view have overlapping action (delay) that we don't normally see on human heads - in that the ears stay put for a frame, and then drop by two pixels. for the last frame.
I'm not sure why you have him shift weight.... it feels a bit awkward. If you want to go for more intense anger, try spreading both feet out and keeping the weight centered. Again, you'll want to use curves and shading to show forshortening.http://www.alisachristopher.us/resources/fist.png
Overall they're good and they match your drawing style very well. ^__^