Hagen: Great paint work! I really like what you did with Stahlmaske. The two-tone look is very original.
As for your skills question, here are my general comments...
The Crimson Scorpion: I see him as less combat oriented and more brains oriented. I would think skills like mesmerize, poison and concealed weapon would be good for him.
The Creeping Claw looks like he enjoys lurking. I would thnk things like Disguise, Fear Grade 1, Stealth
Stahlmaske: He seems to be the fighter of the group. He has the SMG, but I think he looks more like a brawler with things like Intimidate, High Strength, and Fearful Presence.
Just my thoughts of course.