I don't disagree with Blansky, but I don't totally agree either. In my personal opinion and that's all it is, many of the excellent images posted in the gallery
sections could benefit from the use of some fill light, reflector, flash or my favorite white T shirt or whatever, bouncing light into a spot where it is needed. The fill should not dominate or for that matter be especially noticable or detract from the image in any way, but should create subtle separation and compliment the subjects modeling.