Search Tomb Raider TressFX on youtube. It's a very neat option that renders Lara's hair very realistically. It's available only in the PC version. I think in the next game it will look perfect, even if Lara has her hair down.
I'm PS3 player,so no TressFX for me And I don't exactly like the way how Lara's hair are animated then.Of course,it's much,MUCH better than in basic game version,but it's still not what I'm looking for