Hello! I did this on stream sunday (FehInProgress on Picarto) and then promissed a proper tutorial, I hope this was usefull, feel free to send me an ask if you have any questions!
It is a very simple tecnique that can bring a lot of details to your piece!
I want to do more tutorials, so if there is anything that I do that you would like to know the process, or just anything in general, please let me know!
Ejakkulate 