I'm sorry, but I just can't see it. The only way her barrel could be hidden by her mane like that, is if she is rearing up on her hind legs, as it is long enough that it should be visible otherwise. The angle of the wings also seems to indicate that she is rearing up on her hind legs, as if she were on all fours and had her wings fully extended outward like they are in the picture, they would be parallel to the ground. However, there are only two legs shown in the picture, both front legs, and one appears to be on the ground, which is why, to me, she appears to be bipedal in this picture.