step 1 of 6
The very first and very rough sketch... I don't believe in lineart (it's a good thing but I'm too hasty for it) so I just scribble around and use very thin and very large brushes (thin for outline, wide for the mass and color areas)
Here I determine the general position of the figure, the pose, light direction and some basic color scheme. I usually make a lot of changes in the process but this is the start. Details might be added just as a reminder - it's no use working on the details if you haven't figured out how they would fit in...
step 2 of 6
..colors and depth.. no details yet.
step 3 of 6
Blending and adding some details, major changes on the face for a more "evil" look ;)
step 4 of 6
details and I changed the background again - which is not a very good thing as it's hard to place a figure in a surrounding of a different color. The background light always affects other object in the picture, so I had to change the greenish skintone to a red one.
step 5 of 6
For the final version I played around with the "warp" and transform feature for a better perspective. And changed the background again.
step 6 of 6
..and this is the layer overview in a .pst file. I don't use many layers so it's easier to blend it all together.