need help with rendering!!!

i need help with rendering cars. here's picture of one bentley i am working on, i circled the problem:

http://www.imagesforme.com/thumbs/3584Bentley%20Brooklands_errors.jpg (http://www.imagesforme.com/viewer.php?id=3584Bentley%20Brooklands_errors.jpg)

does anyone know how to solve that problem?!

first, i draw car with line tool, than i color it, and then this problem appears... i am trying to solve this problem for a few hours, sometime i don't have this problem, sometime i do.

PLEASE HELP :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead:

http://www.saunderscreative.com/Tutorials.htm

this is a good tutorial, helped me a lot.

also look at existing cars outside, and look how the light reflects and look at the shadows on the car.
the part you sircled on the side of the car up to the headlight is the darkest because thats were the horizonline is.

hope this helpes

what software are you using? if this is corel draw or even PS where you're drawing the lines and then coloring, then my first guess would be to use significantly heavier lines. The problem may be that they are so faint that they are getting lost in the color. You might also consider layers if you aren't using them but that is mainly why I ask what software you drew this with. Thirdly, you should probably look into resolution if you're using PS or something similar. Give some more info and we might be able to help more.