All of these are single brush strokes made with the same #6 round brush. There is a wide variety of line thicknesses that can be made from a single brush.

These are single brush strokes made with the same 1" flat brush.

A)The light colored trunks of the trees show where a brush was used to remove color.
B)The trees and sticks were painted with a round brush using the wet-on-dry method.

The light colored areas in the background show where a brush was used to remove color.
Sometimes only white gouache and a drybrush technique will give a good white fur.

The light colored areas in the background show where a brush was used to remove color.
White gouache was used for Toto's whiskers and pawprints on his scarf. His teeth and other light colored areas are planned by preserving the white of the paper. Most of the hairs were painted with the drybrush technique.

The Baseball Bear's light colored areas were planned by preserving the white of the paper. Details went on last like the baseball lettering and glove stitching.

Teddy Bears are all wet-into-wet painting. To get deep colors and shadows, allow the paint to dry and then add another wet-into-wet layer on top.