How to paint the furs with oil painting?
How to respect the direction of the hair and the movement of the fur?
It's essential to respect the direction of the bristles. I use extra-fine brushes, number 0 or 1. When I can't find a brush fine enough, I simply take scissors and remove the superfluous hairs. Sometimes, just a few hairs remain.
Using medium, I liquefy the oil to obtain a consistency suited to this type of brush. The resulting flexibility enables me to make very long bristles oriented in the direction I want.
How to give the impression of suppleness or rigidity to the fur?
Simply change brushes to give the desired direction to the bristles. With a mesh brush, you can make the bristles more flexible by choosing the inclination you wish to give them. This technique is often used on dry surfaces. A short, fine brush produces short, stiff bristles. Working in the cooler* is then perfectly possible for a good blend of colors.
* Working in the fresh: Working on a layer of paint that is not yet dry.