With a touch up, I can soften wrinkles & fine lines, remove imperfections, makes eyes pop, whiten teeth, get rid of stray hairs, and anything else needed to make you look next to perfect. Below are before and after photos so you can see the difference. 

I try to make the retouch as natural looking as possible but if you would like, I can even go to the extreme and even change your lipstick and eye color like below. 

It's all really up to your preference how much touch up you would like to have done to your photo.