Thanks ahtiandr and dncrmt for your comments. I´m very glad you liked my work.
I have planned to prepare a tutorial showing how I work but here you have a "step-by-step" by now that I hope it´s helpful.
3D geometry was made in 3D Max and the rest of the work in Photoshop. I used photo reference and a lot of digital paint.
The original size of this matte is 4400 x 1875 pixels.
I hope you like it.