It's really the whole face for me, and I don't mean that in some shallow way. It's a full package...the eyes (really expressive eyes or ones that are striking color-be it an odd color or very vibrantly colored or in stark contrast to hair color), the smile, facial hair (kind of have a thing for the mustache and goatee look) and yeah, I like the little crinkles around the eye that show they smile a lot. Oh and dimples! I just love dimples. I take great pleasure in trying to draw out a smile or laugh to catch a glimpse of dimples.