How come painting cars is so hard compared to lets say a flower? Well the main thing with cars is that every little line has to be perfectly proportioned one little mistake and it can screw up the whole painting. This is because our brain is very good at remembering shapes and details around it. While a red rose can have different shades, come in different sizes, different leaves etc, a car model stays the same, so we will spot the difference rather quickly when something isnt correct.
When you do your next car panting, do not rush the early parts of it, the part when you try to get all the proportions right before starting to shade or paint. It doesnt matter if you are extremely good with colors, or your shading technique is superb when you draw cars. If you dont get the proportions right, the end result will not be very good. That is how important it is to get the proportions right. How do you do it? How do I do it?
Start out with a clean sheet of paper, preferably a pretty big one. Find a good picture of that car you want to draw, this picture will be used as reference for your car painting / drawing.
Start by doing some soft lines on the paper, try to...