Personal training on Octane watching the amazing Jama Jurabaev's tutorial :
https://www.artstation.com/artwork/q11Be

Check out the awesome works of Octane Masters too :
Julien Gauthier :
https://www.artstation.com/paohttps://www.artstation.com/renart

Paul Chadeisson :
https://www.artstation.com/pao