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Don't say cheesy things or pick-up lines that you saw on a tv show or on the internet. Avoid such cliches if you want to get her attention. Dig deeper for your compliments. Telling her she has a great laugh or a great sense of humor shows your attraction is more than just physical. Show her you aren't overly possessive by encouraging her to spend time with friends. It is a good for both of you to have a life outside your relationship. Don't get jealous that she has male friends. Jealousy is a big turn-off. Don't be pushy. Each of you should feel free to make your own decisions that will be respected by the other. If she says no to your advances, accept it graciously. Do not get angry if she rejects you. If you are respectful of her decision she may change her mind in the future. If you act aggressively or talk badly about her, it will only come back to bite you. Other girls may hear about your distasteful behavior and it will ruin your chances with them. A bit of cat and mouse can be fun but may get boring quickly. You can play bored or be distant to let a girl know you aren't going to desperately chase her, but you don't want to come off as uninterested it's too hard don't try.
Be original. Give her space. Respect her decisions. Don't be too inaccessible.