So your assignment is basically to "market" or advertise yourself?
If that's the case then whatever picture you pick should, in YOUR opinion, represent yourself.
I would just take a good picture of yourself...if you're artistic, maybe play around with the picture in photoshop and put an artsy edge to it. If you've got a favorite hobby, perhaps a picture of you in action.
Since the project is about yourself, ultimately you've got to decide what you use....nobody knows you better than you know yourself!
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