I’ve recently collaborated with http://yiihuu.com/ for this step-by-step tutorial starting from scratch.
Tutorial contains 30+ hours of content.
Topics covered: sculpting, modeling, texturing, lighting, rendering, and doing some post for final images presentation.

Tutorial Link : https://www.wingfox.com/c/8312

it is based on a concept by Deiv Calviz
https://www.artstation.com/artwork/RmqBO

I really hope you like it and if you buy the tutorial I hope that you find it useful/helpful to you with your own projects
Thank you all !