1. Just a little bit hot, and I think your key needs to move a bit more to one side or the other. I prefer a less tightly composed image, but that's a personal thing.
2. Not bad; a little more contrast in the lighting and a bit more DOF wouldn't go amis.
3. Blue is almost NEVER a good colour for skin!
4. Not fond of the very OOF hand and flower in the foreground.
I think you've got some good potential with these, but perhaps a little more tweaking in post?
This is for the last set, you have an adorable model! Her hair is oof on the left side of the first pic. Same thing going with the 3rd pic. I do like the second pic.