Thank you! I use Photoshop... Pretty old version SC2. As I know already released the 6th version, but it's pretty expensive, so I use the old version, since it licensed for me, and I have become accustomed. I like it.
I was just experimenting. Sometimes I even don't remember the order of actions what I did, I just playing with layers, with shades, with brushes and etc. And I just don't stop until it achieves the desired effect for me. Sometimes it takes about four or five hours, sometimes - adout two or three hours.