Its pretty self explanatory but il try to explain it for you.
Ryky starts by drawing a circle with dark blue, after she uses her pen setting (as shown) to make strokes along side the circle
along with some stroke of a lighter shade of blue, with probably what looks like the opacity turned down.
She then changes her brush settings once more and continues making brush stroke inside the ball (which she uses as an //example// meaning when using this tutorial youll have to figure out where the fur goes yourself)
She keeps over laying the strokes in a circular pattern and then changes the brush settings once more creating highlights in the fur ball
Then uses purple to create the spots in the fur over layers it with another shade of lighter purple, then in the last ball she highlights the spots fur with smaller strokes.
She used Photoshop to do this.