[@Gowi]
These are all image suggestions for your NPCs, I basically just did this for fun, let me know your feedback.
[hider=facematching concepts]
Valdislav Kuznetsov
[img]http://img06.deviantart.net/87fc/i/2012/109/6/a/cinematic_character__viktor_portrait_by_mayrt-d4wdar5.jpg[/img]

Michael Graham
[img]http://4.bp.blogspot.com/-IbbKKx0UkUE/UfIt0Zbq6BI/AAAAAAAAEus/mCx9XA9X_Qw/s1600/Gerry+Cardle+portrat.jpg[/img]

Dr. Herbert Bonheur
[img]https://s-media-cache-ak0.pinimg.com/236x/c8/2e/34/c82e3426daf7b855a150ca489b619305.jpg[/img]

Dr. James Lofgren
[img]http://projectumbrella.net/files/images/67436578.png[/img]

Matthew Alvarez
[img]http://www.cinemablend.com/images/sections/71498/call_of_duty_71498.jpg[/img]

[/hider]

I didnt do Katerina Piroux cause you already had a robust description and I didn't want to deviate.