First off Sarah, welcome to the forum.

As for the three images you posted:

#1 - it is a little gray. You need to increase the contrast, separate to whites and blacks. There really is no focal point to attract my eye other than the hole in the pedals near the top left corner (and I don't feel thats where you want me to look)

#2 - I like this one. The reds and sharpness on the flower, they all work well together. I would have liked to have seen the entire frame filled with hair (like the other two images). The space at the bottom half of the image with no hair does not work for me.

#3 - it has a nice focal point of the knot at the bottom right.

All three images are nice and sharp, colors are great in #2, all technically nice images. I don't understand how the theme ties in with being a female (thats a small lie, I have a wife and two daughters, all with long hair, so it is all over the house). I do think you are on to something with hair as a theme and it could make a great set.

We usually don't comment on the art itself because beauty is in the eye of the beholder. We usually just comment on the technical aspects of the image.

I hope this helps