By the way, speaking technically I think a few of these could be brightened slightly... and compositionally... watch out for too much dead space. Particularly in 4. A lot of the top of that frame could be whacked.
Also be careful not to dead-center something in the frame unless you have a very specific reason to do so (like there's something that leads the eye in and out of the center or something).
Also try to fill up as much of the frame with your subject as possible... unless the background REALLY contributes to that subject. Look at that first one... she's really outstanding in her field... (chuckle) but I don't really care about the field so much, so why show it?
Finally... those wires. EASILY cloned out. I would do it myself to show you (as well as some of the other stuff I've mentioned) but it says your pictures are not ok to edit.