Not bad..
I'm new at this too and what you've done is a great way to practice for sure. In fact, I think I'll go find some rusty old muscle car to fix up..
And yea, smudging things out can leave things looking sort of muddy and somtimes you can see were things were you shouldn't be able to tell.
Looks to me like you got the size and angle of those rims right on.. somthing I still have a hard time with.. Your old front tire does show underneath abit though at that kinda stands out too.
But nice job for new.