Ok, that is a cool thing. i don't like the blue mouth, i'd probably do the silver thing, at least make the mouth look mouth like with a blue outline as they did on the real thing with silver.
Might wanna do something with the spoiler though, it looks bland and unused as it is now, mabye flesh out the roof horn/lump/scoop/thingies as well, drawing them out with some flames or something, iunno
and all told that hot wheels body is kind of tat. I'll have to do a proper one someday along with the usual F150. Shouldn't be too hard