My top favorites are
1. Madlen (MJ95 at TSR) for shoes
2. Marigold (her blog/site is kinda a pain to navigate but the cc is soo worth while)
3. MissFortuneSims at TSR
4. WildlyMiniatureSandwich at tumblr
5. Kijiko (at her blog/site) she makes gorgeous 3d eyelashes that will change your simlife!
6. Serenity_CC at TSR
7. Beloallure at TSR.
There are many other wonderful artists I use but these are the ones I can't live without.