How do I get guys to notice me as a female?

I’m quite a vivacious woman, with lots of female and male friends. My guy friends don’t notice me at all, which is currently what I want. Supposing a guy joins the group one day, who I actually fancy, how do I get him to see me as being more than one of the guys? I’m not a tomboy or a girly girl, but I have a sassy, easygoing nature.

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I’ve been offered the chance at a modelling career, with a real agency, so it’s not that I’m unattractive.
How do I get guys to notice me as a female?
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