Sexual energy in a womans eyes does it for me... Having said that Redheads with green eyes does the trick nicely
As a leg man, hair color and length are totally irrelevant to me. A nice smile and nice legs get me every time.
Redheads, the longer the hair the better. Having said that, it don't matter when I'm in love. And don't forget the freckles!
Hair (and shoes) are the first thing I notice. Long dark brown hair, preferably with some stying (hard part, half up, styled pony tail) or hair accouterments (clips, headbands, ribbons, bows)