This 3 hour tutorial with audio: https://gum.co/pnFRw
https://www.artstation.com/captflushgarden/store/XKPA/environment-concept-art-tutorial-cityscape
Describes the process of concept art from a simple 3D mass-out base to finished vision piece.
The video goes through the steps an artist would take, working at a professional game studio or visual effect studio. Techniques and thought process is also described, as well as more tips and tricks!
Gumroad: https://gumroad.com/johnliberto
Instagram: https://www.instagram.com/capt.flushgarden/
Facebook: https://www.facebook.com/john.s.liberto
Tumblr: http://johnliberto.tumblr.com