Dardee

I am doing a research paper on bowing, especially while in your martial arts uniform. My question is, where do you look when you bow while in uniform? And does that differ on where you look when you are bowing in a social setting? (out of your martial arts uniform) The choices I have been given (thus far) are that you look at a person in the eyes or you look at the ground... Which is appropriate and when ? Does this differ from master to instructor to fellow non black belt student?