So I set out to make the most unhelpful tutorial ever... and here it is!
Haha.... actually I just wanted to provide an example of the workflow I use when creating this time of painting. I like to shift between my normal painterly stuff to this because it allows me to get ideas down much faster.
This was all done digitally with a custom brush.
If you have any questions let me know. Hit download for the full size version.
Final deviation can be found here: [link]