Wow this is AWESOME! Nice attention to details. One suggestion if you don't mind. For a mechanical pencil this is impressive but try using graphite pencils so you can get a wider range of value. If you don't already know there are 10 values in a grey scale, 1 being white and 10 being black. Your darkest dark in here is like a 7. Your drawing could stand out even more if you used the whole scale. Use softer pencils like 4B to 9B to get the darker values. When buying pencils, B's (2B-9B) are the softer leads which will give you a darker values and H's (2H-9H) are the harder leads which will give you lighter values. Mechanical pencil Leads is like an H so you can see why it can only go to a certain darkness. Try them out when you have a chance. I'm sure you'll like the difference. Good Luck and can't wait to see a car drawing in those pencils in the future.
:D Wow!!! Mechanical pencil makes everything looks so clear and neat! You did good with the shading as always!!!! O.o That's awesome....LP 500 S version....that sounds so cool!!!!