These are pretty good.

I'd say these are the strongest:


Some of the others have fairly awkward poses and inconsistent angles.
For instance:

Neck, ears, shoulders don't line up.

Chest guard doesn't appear to be at the proper angle. Same with shoulders, the left side is slightly higher. But eyes and face is straight across.
Another thing that stands out is the clothing / armor is not consistent on many of these sprites. The shoulder pads are different on each shoulder and sometimes you just bend the shapes to make them fit.
For instance:

Look at the left side of her armor and then the right side. None of the parts line up with each other, the most obvious being the hook shaped decoration, which is obviously meant to be the same on each side.
You do a good job at decorating the costume, but make sure you keep the basic shapes of the objects your making in mind so they look more convincing.