Lmfao I went through the same dilema.
Initially tried cutting around the hair... got pretty close but looked a bit... shit, lmao
Then I realised... actually there IS a way to do it perfectly but I couldn't be assed. The way to do it, or a way, would be to... cut around Travolta's hairline (before putting his face on), very precisely with cutting tool, make it a layer, put it on Marty and then 'delete' that shape from Marty's face if you know what I mean... not sure if I explained it well but I know what I mean
LMAO the effort, just to take the piss out of Usman
I'm curious to see it done like that actually, fuck it I got nothing on... but first check out my Being Marty Malkovich in below post