So after 2 yrs working as a flash animator i've finally decided i'll make my demo reel for modelling. So for my first project here's a cartoony hot rod i've made and now i'm trying to model. I don't know if the topology is good enough or I can make it better. I want to make the car's door fully functional. Is this topology good to get that output? And how can i improve on this?

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C&c welcome.
Texture is 512x512 but here it's half the size.
@ TonyNowak: The hot rod is supposed to have run on mud so that's why I thought it'd look dirty like that. Isn't it suppose to look like that?