When it's so heavily stylized (so far away from realism) it's very hard to give any feedback beyond "I like it" or "I don't like it".
A few thoughts:
- I don't know if the Siricide-gentleman is holding a gun or a glass of martini. And I'm not sure if he's holding a sword, a knife or a club.
- The viking horns are too close together, they look like Hyperion's helmet in Immortals.
- I don't understand what the Viking is carrying or what's in front of his face, and the ribbons on the axe don't work very well.
- I think you should reconsider the Ninjicide colour, it doesn't match the others very well, IMO. And maybe a thicker hilt would make it easier to recognise the katana as a katana
Hope this helps.