Sketching postures in Mosketch works only when :

nothing is selected => direct sketching: see solution "Direct sketching"

1 joint selected => direct sketching OR using Up influence (see below)

2 joints selected => using Up influence (see below)

• If you select more than 2 joints, sketching can't work (red color - the system can't understand the user's intention)

 

mosketch button ad

 

S

Sketch brush

• make sure nothing is selected (selected object become white and their influence is displayed in orange)

• sketch directly on the skeleton

• direction: from parent to child

 

direct sketching

 

>> see as well: 
• Sketching with selection

• Sketch Brushes differences