"Thanks for the explanation, and I agree with you completely. I'll spend more time on those sections and try and improve."

"so basically it's all sand particles and some dirt on the tires. the sand is not lit, i mean it's not darker in the shadows..perhaps try some blending mode? also the sandparticles seems to be of less resolution than the rest of the picture. there is a dirtmask on the left front tire, that has no perspective over the tire surface. looks obviously projected from a 2d texture onto the renderpicture. i would recommend to incorporate as many details as possible in the 3d scene, and only finishing touches to the 2d render"

"Sascha, thanks for the comment. Which part of the photoshopping is standing out to you as the most obvious? There are plenty of things I want to work on, and re-render...but I've been staring at this for too long, and I think I'm losing perspective. ;)"

"looks cool nate.those sand stains are cool, though the photoshoping is obvious. clean rendering. add some dustlayer to your material which you then can use as a reflection mask also"

"Render with a wee bit of the old photoshop."