On a physical level, Its the smile. A girl that smiles with both her mouth and eyes has driven my attention span from 40% to 110%. (Now don't get me wrong though, I am still a guy so My eyes might still wonder to the assets every now and then, but my excuse is that its a primal reflex) On a more mental level, I love A playful non- everyday makeup/frilly/bag obsessed/, but relatively smart girl. (dunno if that type is a cliche) I mean a little makeup is ok, if they want to...but don't dive into a pool of mascara and blush lol. Quite a few girls look much better without make-up but they have yet to realize that.