How to get more skins for your character...
You have to play multiplayer to get those skins.Uspilon Forces - third skin Achieve COMMANDER 
level (with a general average higher than 95%) 
Uspilon Forces - second skin Achieve FIELD AGENT level (with a general average higher than 20%) 
Spy - third skin Achieve SPECIAL AGENT level (with a general average higher than 45%) 
Spy - second skin Achieve RECUIT level (with a general average higher that 1%)