Did this image digitally on Krita back in 2016, because I had heard wonderful things about the program and gave it a shot! It worked wonderfully at first, but it was always a bit buggy on the Mac, unfortunately....I hope they eventually release a much more stable version that works on my computer! I love how it blends the paint, kind of reminded me of Paint Tool Sai.
Anyways, I hope you enjoy this work, I think I did this in about 25 hours. I had a lot of fun with it, which is interesting, because it is rare that I create monochromatic paintings.
