How can variety be introduced while maintaining unity in brushwork?

Correct answer: Make controlled changes in pressure, size, and direction within a common stroke language

The governing design concept is unity with variety. Unity comes from a shared stroke language, such as related handling, rhythm, or texture, while variety comes from controlled changes in pressure, size, length, or direction. Option B achieves both without making the composition monotonous or chaotic. Completely unrelated techniques damage unity, identical strokes remove variety, and changing paper is not a brushwork solution.