man, that is some tight shit there.
and i don't mean any offense, but as someone said before, i think you should work on your character design some. just add some physical idiosyncratic tidbits here and there. give the o_O guy a silly t-shirt. somethin' like that. cause as they are, they are aesthetically uninteresting (to me personally). just my two worthless cents.
edit: the van, too. a post-apocalyptic van wouldn't look that perfect. like someone said before, maybe add some mismatching parts, some fading/peeling paint, a busted headlight, or maybe something cool that guy painted on himself to scare off BANDITOS. or like a wizard with some naked chicks. you know, just give the van itself some character.