ahh notbad mate! used to love using photoshop back in the day did some mental motors on it ended up looing all my hardwork though (damn external harddrive :evil: )
only things i can spot is you need to adjust the contrast and saturation on the wheels white is quite a hard colour to get right
maybe raise it up a touch aswell as you seem to have lost the line of the rear bumper
other than that great work
also the side vent doesnt look bad atall maybe run a highlight line along the top edge just to get that refelction
keep us posted