AP is a really nice set of armor. Mike is right about a few duplicate parts, but if you take your time on assembly you can minimize the affect. Other than the mirrored parts, AP is in my opinion at least one of the current best because of the quality of the material used along with the detail captured in that material.
On your new set, there are definitely a few things that I would do to touch it up. First though, before you mess with anything, try it on and see what fits good and what doesn't. Shake around and see if everything holds WELL. Walk, bend, etc and feel for discomfort and chaffing. In the end, the fit is as critical as anything.
I would at least work on the following things:
1) The teeth on the helmet. I'd strip the paint from the teeth and repaint because it was painted too wide. The grey would not go past the individual teeth. The difference is in how you mask. It will be a pain but you should do it.
2) The thighs. One is considerably fatter than the other. Again though, you will have to check the fit on you before modifying. They should suspend comfortably but with less gap than in the picture. Taper them closer at the knees.
3) Like you said, cut open the eyes more. Get rid of the lip.
4) The butt plate may need a bit of work where it comes to the front (the point between the legs). It may just be the model, but it is noticably pointing out from the front. I hook elastic between the front and back and cut it so it doesn't bunch like that.
5) Not really an accuracy thing but a comfort thing... you may want to trim out a section shaped like this _____/ from the top of the back of the shins and the reverse from the bottom of the back of the thighs. It will help you a lot with walking and general articulation.
6) line up overlapped edges and slightly round off corners. Helps you from snagging and poking yourself.
I would start there. If you are going Sandtrooper there is a whole other laundry list. Also, I am a big fan of painted armor now (with the right paint), but that is totally up to you.
Have fun!!!