1. Fill with colors that best convey the lighting.
2. Set the "Wet Bristles Rough" brush texture to "hair" and reduce the interval to 0.02-0.03.
3. Use light pressure on the graphics tablet to mix the colors, creating the fur texture.
After a few days of trial and failures (and deleting a lot of sketches), I finally figured out how to draw detailed fur. I hope this step-by-step guide how to draw authentic fur in Krita will save someone some time.
I started drawing not on paper and I really wanted to start it with a drawing of the most beautiful furry on earth @KrunchFursuit. I hope that with experience in drawing I will become even better