1) My favorite of the set. I like your DoF here. I rarely like tilted images but here it really works, particularly as a counterpoint to the very straight lines of her pose. My only suggestion is that I might have left just a tad more space on the bottom. You did a good job of not amputating her toes, but her right foot is so close to the edge of the frame that I almost get the impression she's stubbing her toe. Somehow the tight framing on top doesn't bother me as much, probably because it's such a large hat that I feel she isn't actually bumping her head. Fine line, I know, and without a wider crop to reference I'm not convinced I'd go wider, it's just a thought.
2) My second favorite. You've violated two "rules" of portraiture - you're subject is square to the camera, and she's centered in the frame - and in this shot it absolutely works. I actually like the busy background here. It's out of focus enough, and dark enough to contrast with her hair and hat, that I feel it provides some context to the shot without distracting the eye from your subject. And even thought there are members here who will ask why this isn't in portrait orientation, I think the landscape orientation works well here. Again, it allows enough background into the frame to provide some context so that you have a picture of a scene, not just of a pretty girl.
3) Sorry, not a fan of this one. The background is way too busy and not nearly enough out of focus to stop being a distraction. The tilt does nothing to enhance the image so only comes off as hokey. And shooting from above (which worked really well in the first image) just seems wrong here. Maybe it's because it feels wrong to be viewing from that high in a bedroom (whereas the location in the first shot is so undefined we don't have an instinctual comfort zone). On the other hand it is a nice capture of a lighthearted moment. Worth having as a well-timed snapshot, but not up to par with the other three.
4) While I don't like it as much as the first two it corrects everything I didn't like about #3. The camera has come back down to her level so it feels natural. There's no artificial tilt. And the background is so out of focus that, even though it's the same busy scene, her face now pops. Unlike in #2 I don't think the background adds anything, so I might consider going with a tighter crop (take a look at it with a square crop, all the way in to her shoulders).
Well done!