This is more a step-by-step of showing the way I work than a "how to" technical tutorial, not sure if it makes any sense to you all, so please let me know if you want to see more contents with technical skills ect. That maybe I can balance it better by next try. This sketch is done using Adobe Photoshop 7.0.

Step 1

This is the typical way I start off, I filled the background with a warm gray that I already had my nice midtone. Then I threw down a few strokes with the default simple round brush set to fairly big size, by which I can see the silhouette and big shapes better. At this moment I didn't yet know what I was going to paint, I was still waiting for the "happy accident".

Step 2

I let things go a bit further and kept watching what those abstract shapes could tell. It's important to keep it spontaneous at this stage so that you don't get stuck with one idea too soon. After hitting a few more strokes I saw some potential qualities in the shapes, I then decided to paint a car.

Step 3

The design was based on a 'Three Wheeled Speedster' I did a while back. It's always good to setup lighting at early steps, which provides you a base for working values out. In this case, light was supposed to come from almost right above. I quickly blocked in some main parts of the car, you can see here I used a dynamic perspective, which was just considered for the fizz, not really necessary.