[Maple;]

The diagram with the 1 next to it; If you draw this on one layer, put another on top and go over it, this helps with the actual drawing part.

The snow; Dont do perfect circles click and drag up or down a tiny bit and it looks a tiny bit more realistic.

Smoothing; Smoothing makes the brush go slower, since I dont have a tablet this helps a lot. I usually do around 90 but experiment and see what you like, though it takes time to get used to. If you dont know where that is look at this.

Layers; add a layer with the plus button on the bottom, I recommend doing this right when you start and add a new layer for lines, colour, background, ect. to make a layer less visible just drag the coloured bar to your left and if you dont know where it is look here

Hope this helps!