Number 3 is J.K. Rowling. I think that's a PC with CrunchBang on her lap. You can tell because she looks "contented".
Running testing/unstable? Discover which packages installed on your system need help to be included in Jessie:
# apt-get install how-can-i-help
# how-can-i-help --old
Nr. 1 is Dave Gahan from Depeche Mode.
no 2 looks a bit like lennard pottering...
It isn't him but you can find out for sure my grabbing the image URL.
Then plug the URL into a reverse photo search as explained in the link below:
============= You are the dreamer - and the dream =============
gooplusplus.com (goo++) --- compact web tools + 240 internet radio stations
i did look at that link - but lost interest after it didn't work/didn't totally understand it.
actually i just standard googled the last part of the URL and scott heifferman came up.