Step by step breakdown of the painting "Son of Saturn, Angel of Misfortune; Watcher on the Walls of Agartha" is here on my blog: https://www.alexbrockart.com/blog/2017/10/18/gargoyle-process
It goes through my thought process as I was creating the image, some of the references I used and some tricks of the trade.
This download - https://gum.co/TRbAN (which is also in the blog post) includes over 30 hi res (2000px) process images, full res closeups, FULL RES .jpg of the finished painting (8000px), 2000px .psd file with layers, and my brush presets (I don't know if they'll work if you don't have the original brushes they're from though). Enjoy!
If you'd like more of this stuff in the future when I finish new paintings, please check out my Patreon - https://www.patreon.com/alexbrockart