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Took me a while to work out they were grenade pins he was spitting out! (looks like some cartoony glasses to start off with)
I think you need to make the link a bit more obvious - show us a grenade with the pin still in, somewhere a bit more viewable on his body/hand or something.
I love your smoke! The colors are perfect. I agree w/ Venger about the pins tho.... I think its just how perfectly symmetrical the two pins are that throws me off. Still badass, nonetheless!
i think you should add some more light around the character, espcially if there's fire that close to him. it seems to get darker as you move closer to the legs, and i would like to see some highlights on those legs. one more thing, i think you should add some line work to the cloud like fire smoke in the background, make the character and background more unified, just a thought.