First off, Welcome to the forums
I have just one question about your character, is she a earth-style
user/bender/something like controlling earth?
If your looking for feedback on your character;
-The face sprite is nicely styled and the coloring of the head is well
done.
-Standing frames - Her legs change size, and her shoulders are a bit
too wide when compared to the concept art, but pretty good all up.
-Walking frames - other than the shoulders, it looks pretty decent.
-Punching frames - Her legs shading changes sudenly, but its a nice
looking combo, its only the shoulder width again that throws me

-The Rock - is nice, the shading stays the same throughout, but thats
harder to notice, so not really a prob.
The concept art is well done, very manga-ish, I particularly like the
detail in the shattered rock in the bottom-right.
Hope this helps