Hey thats a great start. I dont see a problem in the modeling itself. Only some minor things. The textures of grill and frontlights are a bit too big and it seems that the bump? on the frontlights might be too much. And your taillights look too big, not sure...they just feel big.
As for your rims, you could maybe go whether for OZ-Racing wheels or maybe some Borbet A or of course the classic BBS RS rims! Whichever you choose, itll look great since they all have been used on a 190!