Um yes, if it is hand drawn, scanned would be preferred; whatever method provides the best quality
Oh sorry, OC is original character, i.e. you create your own character.
Referring to theme #2: If your art style is anime, then I'm basically asking you to make an anime / cartoon version of my friend.
For theme #1: Its basically just redrawing my character (based on the images I linked) in your own art style and adding in or removing anything you like to make it more personalized (revamping it).
And with the happy birthday sign of course :p