Brush set

The first group of four sets is a group of custom brushes by the wonderful artist Marta Dahlig.
The sets are subdivided in: skin&hair, fabric&costume, nature&environment and the elements.

Other great artists who shares their knowledge and ability, are
 Katie De Sousa... Dan Luvisi aka Adonihs....
Diane Özdamar with her Hanagumori's set...

Sakimichan

and also this useful sets and tips...

for hair, the Cellesria's brush set...