The first one, the focal needs to be blurred. I also would've liked to see it a bit more vibrant.
The second one, the girl is stretched. The focal doesn't blend in well. The distorted arms of the girl looks weird.
The third one, the render was badly chosen because the colors for the background and the render are unappealing, it looks really gross, makes me think of puke, although I guess someone else might think differently.
The fourth one, the body was blended in so much that I had to analyze it closely to realize that her body was in there and it wasn't just some blurry effect, it's causing floating head syndrome.
These are all very, very nice tags. Overall though, they all look a little too dull, just because of the lack of vibrance. I do some of my tags like that as well, but I guess it might be personal opinion on weather an image should be less vibrant or not.