I definitely agree with "prettiestwreck". If a guy smells really good I go totally crazy. BUT I am not suggesting that you put on a whole bottle of cologne. This might sound cheesy, but you could ask some girls you know like a sister or friend and ask them what they think smells good just to get idea of what girls think smells good.
Dressing well will pretty much guarantee you points with a girl but if a girl senses or sees that you are cocky or totally in love with yourself, she won't like you no matter how nice you dress or anything.
*This isn't what you were asking but I wanted to say that you shouldn't change who you are for every girl just so they will like you. If a girl wants to change everything about you or makes you feel like you're not good enough then she is deifnitely not worth your time*
i'm a looks girl and 16 from the UK like you babe - 1 think , confidence is Key! guys who know what theyre about, take no sh*t and stop for a second to look you up and down then move on really turn me on ! you'll get slapped a few times but hell ! you just might get ass!