Sounds like you want definition more then mass so first i'll suggest watching the ol' diet. The less fat you consume or things that turn quickly to it the better. Your young so it won't affect you as much but you'll feel better. I really would shoot for getting to body weight in BP, more as it's good to have a goal then just kind of blindly wandering around. Your curl is pretty decent. Do you have a workout plan so your bigger muscle groups are being worked consistently? Some military press front and back, some upright rows, these will help sculpt. And I will always push cleans a good overall upper body lift, don't have to do a lot of weight to work hard with cleans.
_________________
I don't have time for all if it, so I pick my battles. I concentrate on spotting and weeding out satanic paper, handkerchiefs (do you really want Satan that close to your nose?) and eggs. I can spot satanic eggs at Wal Mart like a frickin' drug sniffing dog.