More renderings of each on my website
http://milosparipovic.com
Attachments
awesome sculpts, I recognise each one 
I don’t know the actors real names, but I recognize John Locke from Lost and the guy who played Sylar in Heroes. I also recognize Wentworth Miller.
The other 2 I think I just don’t know them, I’m curious to know who they are. Nice heads!
Wow man very look likeness exercise and well executed !!!
Ted hairs look really really good, would you mind making a quick tutorial ?
Bazinga!
Thanks!
The second one is Jim Parsons from Big Bang Theory (Great show) and the last one is Ted from How I Met Your Mother.
There would be much more sculpts if I had not watch all of those series and several more 
Ted’s hair is Hair&Fur system that comes with 3D Studio MAX. By the way I find this system has horrible usability. At the end I converted hair to mesh (6M polys) and moved it to ZBrush to make adjustments there since it was easier. I will try to make myself do a tutorial when I start working on new head sculpt, but I am not sure it will be soon.
If someone is interested in sculpting process here are several Savelapses of headsculpts above
John Locke
And a print of John using a foil cutter
More images here:
http://milosparipovic.com/index.php/3d-print-john-lock/