Ooh, this one's very interesting and so far it looks great too!
I would suggest adding some more shadow on the tire to make it look like it's deeper in there. Now it looks like it's touching the body panels. Sweet tire donor by the way!
The wrinkles in the rear tire and how the car looks like it's weight is all the way back with the front wheels off the ground (which I think you should definitely do!) suggests that it's sprinting off the starting line. So there shouldn't be any tire smoke.
And about the wheelie bars, maybe just by moving the left one a little to the right would take care of the perspective error.
I would suggest adding some more shadow on the tire to make it look like it's deeper in there. Now it looks like it's touching the body panels. Sweet tire donor by the way!
The wrinkles in the rear tire and how the car looks like it's weight is all the way back with the front wheels off the ground (which I think you should definitely do!) suggests that it's sprinting off the starting line. So there shouldn't be any tire smoke.
And about the wheelie bars, maybe just by moving the left one a little to the right would take care of the perspective error.