A good start, with the simple, but bright colours and the computer game cartoon layout, this certainly encapsulates the better, more entertaining side of paintball combat. From looking at the weapon, this is more of a paint gun than a paint ball gun, though I'd assume the principal is the same.
While I'm not quite sure what the ear-like flaps of hair are for, they certainly add a dimension of perhaps protective cover for the combatant, while the squid-like familiar in the background looks entirely too cute to think dangerous... perhaps until it's too late, then he inks his opponents.
If I were going to be overly critical, I'd suggest that this piece yearns to be made into an action pose, mid shot, while an opponent is rushing onward, trying valiantly to cover her in his gooey, pigmented secretions - ooh, er.
Keep up the good work, the lines flow nicely and I think we'll see a lot more from you in the future.