[gs1403]

Just a suggestion, learn how to really sketch and render on PS. This will improve the quality of your renderings dramatically. There are tons of tutorials on Youtube from actual designers (not clowns like Sketchmonkey). For starters, look up Leandro Trovati's channel - there's a huge goldmine of info and tutorials there.

Learn how to sketch first (on paper) and visualize surface changes. Learn a little about form, volume, proportioning and the thinking behind BMW's design language. Then move onto visual communication ("rendering" with the understanding of light sources, surface changes, 1/2/3 reads, etc) so you can present these ideas more effectively. Your renderings show a very elementary understanding of any of these concepts and they will always fall short unless you start from the beginning.