Before you start drawing, it's important to pick the right reference image for your drawing. Browse through websites on the Internet or make a search on Google using the image search feature. Or you may wish to select an image from your own personal collection of car magazines.

Whichever way you use to choose the reference image, always remember to choose an image that's well suited for your own skill level. If you don't feel comfortable drawing complicated stuff, choose an image with simple shapes and forms. However, if you think you can take on something more challenging, by all means, go ahead and pick something that's more complicated.

An example of a complicated car image is one of a car sitting under a tree. The shadows made by the leaves on the tree will cast lots of weird looking shadows on the car. If tackled correctly, the shadows actually enhance the drawing but if you do not feel you have the skill or time to draw complicated shapes, leave them out.

Once you've selected the reference image, it's now time to transfer the image to the drawing paper. You may use the grid method to do this. By drawing matching grids on the reference image and the blank drawing paper, you should be able to transfer the exact form to the drawing paper without any major problems. Keep the lines light as you draw and watch the shape form. Correct any lines with a dust free eraser as you draw.

When you're done with the outline, you may start working on the details like the windows, car doors, etc. You should still be working lightly as the drawing is still in its early stages. Do not remove the grid lines just yet. Continue to work on the proportions and the general shape and form of the car until you're satisfied with it.

Begin giving the drawing different grey values by shading. To do this, you need sketch pencils with different values. I recommend using pencils from 2B to 8B. Pressure application can darken the shades as well, but it's not as effective as using a pencil that's dark naturally.

Since the body of a car is metallic, it's important to use blends and highlight to show case the body of th car. This requires skill and practice. Once you're done with the shading, apply the finishing touches by removing any unwanted lines (like the grid lines) and rework any areas that didn't turn out too well.

Keep working on the finishing touches until you're completely satisfied with the final output.