Welcome to the thread poa.
Personly, I usually attempt a brightness\contrast as the first step on every pic. If I can't see anything, I give up. (Please note, I am far from perfect. And will not "boast" of my perfections.)
Some dislike the "Color Burn" appearence. Others state it brings out the details. I prefer to use a localized "unsharp mask" on the areola\nipple.