@maiyeu12 - it depends, you can use whatever you want and different pics from different people use different mods. Here is list of mods one guy uses (his pics are not in this gallery), his characters are awesome (example: http://static.skyrim.nexusmods.com/images/3526455-1358207975.jpg): Better females by Bella. Women of Skyrim-Enhanced female normalmaps. The eyes of beauty. HN66s Long Eye Lashes. Seductive Lips. High Resolution Scars by Xenius.
Whether it's all mods he uses or just some, i do not know.