You know, I always pictured Draco's hair like Julian Sands in 'Room with a View.' It's like he made an attempt to slick it back, but it keeps flopping back into his face.

I hope these links work:
http://2.bp.blogspot.com/_DKcZQ4C7Ij8/SiHHcMwi_dI/AAAAAAAAA0I/x6q2u7Kshgc/s400/sleeves+4.jpg
http://farm4.static.flickr.com/3452/3229010842_079fcd67ba.jpg

For some reason, I can never get a strong enough visual on Harry.