The AC unit was already commented on so I will leave that out, however do keep in mind for the next time you are looking for good shots that sometimes things will pop in there and you need to look for them!
1) This screams artist lean all over. I'm not a fan of the tilt shot, especially when there is a powerful block of horizon line going through a subject. Speaking in terms of the composition it is not bad (follows rules of 3ds) but then you kill it for me with the all black shirt with just a small slice of arm popping out. Compared to the rest of the colors in the area this is almost startling. Sometimes you can get away with this crop, and I don't know if its just me but it appears as if she has a nub for an arm, even though she clearly doesn't (take this comment with a grain of salt). Her skin feels ice cold as well, even if she is slightly pale in real life there is no reason for her to look almost blue.
2) Identical artist tilt to the first one, this one is quite unnerving with the inclusion of her being closer to the right of the frame as well as your lens being at a wide angle making the vertical line of the brick swing a lot. We've got gutters on the right side, and even though I said I wouldn't I am mentioning it anyway =P as well as the AC on the left. Skin is much warmer in this one and is probably her natural tone from what I can tell. The above the subject my-space angle is a bit cheesy in this case, she has her head tilted quite a bit, and for my taste her chin could also come up.
3. As many have said the selective coloring is...well a bit...you know. The image is only semi-desaturated so this pulls away from the selective coloring from being so overpowering, however it is still a bit much to me. Overall just uninteresting, hands and feet. Not quite explaining anything about her, isn't very artistic :| though judging art is impossible to do. As you can probably tell I'm loosing steam here, been up all day so I'm going to leave you with this.