Krita is a free and open source, KDE program for sketching and painting, offering an end–to–end solution for creating digital painting files from scratch by masters.
Fields of painting that Krita explicitly supports are concept art, creation of comics and textures for rendering.
Modelled on existing real-world painting materials and workflows, Krita supports creative working by getting out of the way and with snappy response.
You can download Krita for free (as well as all the latest news and improvements) at Krita.org
The documentation is online at docs.krita.org and includes introduction guides and tutorials.
See what other Krita users are doing on our forums.
If you are having trouble uploading krita made images, check this tutorial for a step-by-step for converting your image to a nice deviantart-ready png or jpg.
If you have any other questions, the best place to ask them is krita-artists.org.
We only accept images that had Krita used in making them. When submitting images to this group, be sure to tag it with Krita or mention Krita in the description, so that we can verify that.