Krita is a professional free and open source painting program. It is made by artists that want to see affordable art tools for everyone. It can be used for concept art, texture and matte paintings, illustrations and comics.
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Pixel Art
Pixel Art refers to the charming, simplistic, retro/renaissance style of very-low-resolution graphics, such as from the 1977-1995 Atari, GameBoy, & Super Nintendo (SNES) eras.