I just signed up here because of all the great work I saw while poking around. There is a lot of talent here, and I hope to get some good tips. While I do build model cars, I am trying to get back into drawing cars again. While I do free hand renderings for a local architect, I really enjoy cars. I recently decided to combine both. I did a rendering of a model I built last year. I have to figure out the photoshop thing, but for now, this is what I do. Markers, colored pencils & pastels. The scans never look as good as the original, but this one is the best so far. I would love to hear your comments.
First, the sketch.

Now the model.