Firstly it has a lovely painterly feel, but there are things that could be tuned to improve the render.
The wheels could be more detailed and the rear wheel should have a slightly tighter ellipse.
the side expression is good but for mee too many lines meet at the headlamp so the surface looks confused. I would suggest some surface fade around here (i..e lines fading before the lamp).
Some of the colouring is starting to get a little muddy in places (especially the headlamp and front end). And it might be nice to suggest a bulge or flange around the wheel arches to add more depth and reality to the image.
Designwise I like it; the face is novel and pretty tight; I see what Polo means about lots of lines converging on the light although that is partially explained by the lighting position you've chosen. Not too keen on the drooping shoulder, makes the distance between the crease and the wheel seem weak, and the crease itself reminds of the bags under a tire eye or something. I dont quite understand the black triangle on the doors; it is body shape or glass? And why does it run close to but not match the angle of the door shut? I'd lose the black and put in a rounded shape to suggest a BMW Z4-style sill maybe. I really like the front graphics and colour breaks, however the juxtaposition of round head light with triangular fog is a bit jarring.
Actually no I do like that, I take that bit back.
Also the roof seems to rise up into two rather high hoops, I might make those lines faster.
The reflectivity of the surfaces seem a bit inconsistent, which suggests differeing surface texture. An example is the window glass which looks blurry and matte at the front, and the bodywork lokos matte all over. If this is intentional thats cool, but it wouldnt be a big job to add some tree lines, the sunset and a hint of reflection of the guy in the side panelling. To be honest the oly reason I go to the trouble of putting people in my renderings is to reflect the in the bodywork to help describe it.
The image is oddly cropped and would benefit from being laid on a page to let it breath.
Overall a cool image, with a bit of finessing it would realy have some punch.
I would either lessen the droop on the hind quarters or make it remeniscent of an XK120 and raise the line to nearly match the curve of the wheel arch. Besides that one thing, when can I buy one?
Thank you all for commentary! I and itself now see their own mistakes - but work old! But here is one more work - crossover. Excuse me for bad english!