Lizardman Frontlines Lineart Picture

This is a picture I am working on. It is a group of lizardmen who are getting ready for battle. This is a giant lizard riding jungle lizard man and two desert lizardman warriors. What do you think? Should I color it or shade it?
2009 San Francisco 112.
Lizardman Frontlines Lineart
Zane New Ref
Aeris: Cillian Areonn