Those pose and body coloring is really good, but it would be nice if you fixed the hair a bit. The end gradients into white a bit too hard (Green is probably ok but blue is kind of too light, and pink is way too bright), and on the left pink gradient it cuts into the blue gradient too quickly, also on the right side of the tail the pink tail gradient could be rounded out (where the border is green it becomes concave). Her eye also has a purple to pink gradient. Don't think I've ever seen the shine dead on the pupil, but it looks ok, she looks mean.
Just some points I observed from starting at my own lines for hours =T
Also something is off about the crown perspective, and I don't know what it is. It's the way that they draw the character in the cartoon, which makes it look strange I think, making the crown appear to float. I probably did the wrong thing in my drawing and just added an extra bit of hair to fill in the dead space, since it kind of usually wraps around the horn anyway