landeg:
I was writing this up for a friend and thought it might be useful for other people who are looking for a free digital art program alternative to Photoshop, especially one which can run on a Linux OS.
Krita is my recommendation; it is free, open-source digital painting/drawing software that works on Windows & Linux, and with a Beta for Mac OSX 10.9. If you have experience with other digital painting programs, then the learning curve, in my opinion, is not very steep, and the UI is intuitive enough to grasp if you are new to digital art.
Website: https://krita.org/
Krita comes with a huge number of brushes - brushes that are actually useful for drawing & painting. The number may seem a little daunting, though, and some brushes have very specific applications; so I compiled a list of my favourites. Some of them are versatile, basic brushes that could be a good place to start exploring the program, and others are brushes I think are particularly unique or useful, for people who aren’t new to digital art.
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This isn’t about Sailor Moon, but it is a great free resource I think so many artists on here could benefit from! It’s not just a great alternative to Photoshop, but also a powerful and versatile program in its own right. The vast majority of my art for the past few months has all been made on Krita. Try it out if you’re interested in digital art, or spread the word to your artsy friends!