In the first picture, it looks like her hindquarters are sloping too much, and she looks toed out on the hind. Maybe it's just the way the photo was taken...not sure. LOL.
The only other thing I see is that she has a big belly (like meantioned in earlier posts, LOL) and is a little undertoned. Otherwise she looks like a sweetheart to ride, and she is tracking up nicely in the fourth picture. LOVE her face! Too beautiful!