Generally speaking, because the scalp skin is stretched, filling with bone cement can increase the forehead by 0.5 cm. The top of the head can increase by about 1 cm. The back of the head can be increased by about 2 cm. The coverage width of surgical filling is about 10- 12 cm, and the parts with muscles cannot be filled. Like temples and brow bones, they cannot be filled.
You can consult Korean sculpture for details.