
Here's a rockin' step-by-step of one of my various working methods. It is fast and fun and just messy enough to feel like a kid.
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1) lots of drawing and re-drawing using tracing paper

2) Transfer to watercolor paper (Arches 300lb hot, unstretched). I use blue ball point pen on top of the sketch, and carbon paper under the sketch.

3) Add a warm tint the paper with a wash of Burnt Sienna watercolor (Daniel Smith). This gives the next layers of color a unified 'warm' tint. Air dry, or hair dryer.
4) Mask highlights. Darken the linework - I used a Derwent water-soluble pencil for this one, to create a softer linework (though I abondoned the 'soft' look later - see below).
5) 'Pool' in colors of Ultramarine and Hansa Yellow. This allows me to set the warm and cool areas of the painting.
6) Add more color, and add colors with granulating properties.
7) Define darkest areas. Pencil in darkest areas, such as occlusion shadows (the area where two forms meet).
8) Scan into Photoshop, and begin digital process: adding color, define forms further, add stars, add bold line work, lights, and highlights.

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Hey - that's it! A fun process since it combines the best of analog painting and digital.