really really REALLY depends on your face. I know a guy who looks ugly with short hair and drop-dead-gorgeous with long hair.
from your pictures I'd say keep it the length it is. to get beiber hair you'd pretty much have to wax it in place anyway. if you need additional motivation, just remember that girls love having enough there to run their fingers through & hold. ;)
I had (still do) about your length hair and girls seemed to like it. Most girls I asked said I should keep my hair the way it was if I asked them about cutting it. It seems like the older they get though, the shorter they like hair. It will always grow back if you do cut it.