I don't have a modeling agent yet and was wondering what's the best way to go about it? Via e-mail or open call?

You mean agency, I'm guessing? E-mail isn't the best way. I'd recommend looking at their website to see what they say about being seen. You could call and ask for an individual appointment, or attend an open call.

call up the agencies, or look on the websites to when they have open calls and go. Wear VERY light makeup, they want to see skin. Do not "do yourself up", agents want to see simple natural beauty.