First it's the eyes, and a lady who knows how to use them, with a smile that hints ....
Physically, I like dark girls, olive skin is nice, long shapely arms and legs, nice flat tummy, or if blonde, then fair skin is appropriate. Pretty feet are nice, and long fingers.
I also love strong features, so a girl who thinks she has a big nose of thick lips will be doing it for me, and I love downy hair on a girl's forearms, I think that''s dead sexy.
A girl who is sure of her appeal without being arrogant about it is nice, and of course none of the above matter unless she has some interesting conversation, and doesn't adore modern r'n' b music!