Ah now I understand, from the bubble gum colors I've thought it was some kind of cartoon car, it certainly looks like that IRL, never heard of it before either.
In regards of tires, learned a couple of things from @chargingcar while building the Formula 79, and I can tell you the same thing he told me: your tires look too flat. Look at the pic you posted:
You can see the curvature on the tread, is not completely flat like on your model. Even if it is a little bit, makes a lot of difference in 3D. Also the texture looks like plastic, you got the details right but lacks depth, specially the tread, needs some dirt and road damage.
In regards of tires, learned a couple of things from @chargingcar while building the Formula 79, and I can tell you the same thing he told me: your tires look too flat. Look at the pic you posted:
You can see the curvature on the tread, is not completely flat like on your model. Even if it is a little bit, makes a lot of difference in 3D. Also the texture looks like plastic, you got the details right but lacks depth, specially the tread, needs some dirt and road damage.