What does the beginning of Arhat mean?

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