Old Gsi of Fabio

Old Opel GSI of a long lost Sicilian rally team , the reference photo was taken in their last year i think , 1989 , this was pretty hard to draw, and it shows lack of experience , it's my second complex background , and something its wrong with this but can't figure it out ... anyway the customer liked it and wanted the drawing this morning so ... this is it ,
i used derwent colorsoft pencils and some black markers on the shadows , white acrylic paint here and there and some green and brown on the vegetation all this on a bristol board!
i cropped and adjusted the rgb levels in ps 3 ...
if anyone sees the "wrong" part in this drawing please let me know ! thanks