Here is the step by step 
Seb. Larroudé AKA –rainart-
2D & 3D Matte painter & compositer artist
Ubisoft (Montréal studios) – STEAMBOTSTUDIOS
www.rainfx.com
www.steambotstudios.com
Passionate about moving images and set design, Sebastian began with creating set models before deciding to buy his first film camera. From that instant he decided he would get into computer graphics. After graduating with Photography, Visual Arts and Computer Art diploma he began illustrating scientific data, then architectural and design rendering for various companies and agencies. He perfected himself in Matte painting as a passion, developing his own techniques. He is currently serving at Ubisoft Montreal as GFx Artist and juggles regularly between Compositing, Matte Painting and GFx (with a specialisation in particles and cloth). He strives to mix his high rendering qualities in an exciting videogame development team.
I find that using ZBrush for Concept and Matte painting is an excellent technique. It delivers effectiveness, productivity and freedom to create environments in short timelines.

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