i know this sounds odd, but they usually have the same eyes...and the eyes have a direct, clear gaze and they don't just look at you, they look into you. Doms carry themselves differently than other men...they are extremely confident but it is something more that i can't even express...the submissive in you just instinctively responds to it like a magnet to steel.
did you ever have a kitten and enjoy watching it gambol about? that is the same look they have sometimes when they watch you. it's kind of like quiet amusement mixed with being very taken with you, enjoying watching you flutter. oh boy...