Hello. My new workflow tutorial is out
Close to hour long workflow tutorial edited together from ca 5-6 hour of material.
It covers sketching phase, 3d blocking and Photoshop rendering. 
You will get: video tutorial (with audio), PSD (all layers), brushes, Tools, keyshot scene, kitbash obj.

available here: gum.co/vEyBa
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5 chapters of 3d-coat exploration with audio. From basics to advanced without going too technical. Additional two Photoshop over-paintings with brushes and layered psd files. https://gum.co/EnEAx 

This time-lapse video shows my photobashing workflow. No 3d, Photoshop only. https://gumroad.com/l/TXELz

This 1h time-lapse video shows how I create a quick mood-board and add 3d design to support it. I`m using Photoshop and 3d-Coat. Included brush back, 3d mesh (.obj), step by step psd file and a bonus clip with few Photoshop tweaks. https://gumroad.com/l/iFsCL