The hat is so wide that I think the horizontal composition works.
The second would be excellent except that she's looking the wrong way -- "out" of the frame instead of "across" so the whole thing feels a little off kilter.
The first feels soft, the focus appears to be right but perhaps the shutter speed was low or something, or possibly some part of post squished it. The skin feels a little too hot to me too. I kind of dig the expression, though.
The third strikes me as excellent. If this is a crop, I would re-crop slightly looser, however. The hat is wonderful, we want to see it! Also, the flower on the wall (?) upper right is distracting. I would tone it down a bit, just desaturate a little bit, both the blue and the yellow, and maybe burn it down a little darker while you're at it. Somebody or other on here is fond of saying that your eye will go to the brightest thing in the frame, and this here is a pretty good example of the effect. A light touch should be enough to make this image much better,