1. Choose paper with rough surface or soft texture to increase the friction between the brush and the paper. The greater the friction, the greater the resistance.
2. Increase the vertical pressure of the hand on the pen, that is, press it again. This vertical pressure will increase the friction when the pen is forced on the paper, so the resistance will increase, but this method has no effect on the performance of the pen force.
3, wrist movement, so that the pen is contrarian, that is, the backward direction of the pen is opposite to the stroke direction.