In layman's terms, the forehead above the eyes has a high bulge
It looks a bit like the longevity star's head in ancient mythology
Many Arhats will not grow long. This "head" comes out
The rosy cheeks and high forehead of this variety symbolize good fortune and longevity, and the "ink-spotted scales" of different shapes on both sides have a magical effect in promoting wealth in Feng Shui. Of course the better ones are also more expensive