Boys, what can a girl do to make herself attractive?

I've always been a tomboy and short, freckled, frizzy hair and flat chested. I'm just wondering if there's anything I can do to make myself more attractive. My best friend at school is a boy, and I want him to notice that I'm a girl :$ Anything looks related or behaviour related. Mind, I don't want to change myself drastically or anything like that, I'd just like some opinions on what I can subtly do to make him look at me in that way. Thoughts?

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