I vote for both.
I'm a new user here but I know tagging something with many things can help find specific pictures. I do, with that, when people upload pictures that they do a bit more work to tag them, not just put tagme and let other's with more will power do the tagging for them it's like spoon feeding a baby who got in the chair himself. I'm fine with tagging someone else's picture but I wish they would just be abit more general with their tagging like adding the color of their skin and the color of their hair that would be just fine, then they could add tagme. Wow this is my first forum post but I feel like I just wrote half a page lol.