I think we should have the following tags (my reasons follow them)...
"smirk" - "smile" is normally used for happy pictures. I think "smirk" could help us locate "evil" pictures, or "coy/plotting" pictures, no? And it's sort of easy to decipher between the two. I mean, look at them: smirk is slanted ( :\ ) and smile, of course, is bent (
)... Don't you agree?
"nervous" - It would help find pictures of girls with "sweatdrop." Just an idea, though I'm not sure if "shy" should be able to cover 'nervous' since nervousness isn't exactly the same as shyness... from my own knowledge, anyway. >_>;
"x3" or "XD" - instead of having to type both ">_<" and ":3", or ">_<" and "smile"... I think it'd be a bit easier. In my opinion.
"shin highs" - for those socks that reach just below the knee.
Anyway, those are just the ones I've been thinking on. XD; Sorry if I bug anyone for mentioning them... >_>; I know that the tag team has a LOT on their plates, but...
Just a few I think would be nice to add. :3