Updated version of the original 3 brushes, minor changes. The old version is still here if you would like to try them.
(Text: Canvas is 300 DPI and 1000 x 1000 pixels. The sketch brush is 20 px with slight blending qualities, its rough but opaque.
The paint brush is 30 px with an increasingly more gradual blend than the sketch brush. It requires more than 1 layer to be opaque though.
The solid painting brush is 30 px as well and has a smaller blend than the solid paint but still decent. Can be mostly opaque on the first pass.)
(Text: The paint brush has slight hue variation as you are painting a stroke as well as individual stroke variation. Some colors mix while painting a stroke so its not very noticeable.
With the solid painting brush the hue variation is only per stroke and not directly on the brush tip. Its very slight and good for small variation in color.)
An example drawing using all of these brushes.
Feel free to edit as you like, give it a heart if you enjoyed using them.