[grugagag]

Fascinating to see how the paint cracked. I zoomed in around the faces of the three men on the bottom right hand side and there are light areas on their faces with few cracks and dark areas with lots of cracks, eg around the noses. I wonder what caused that.

[mejutoco]

I do not know of course, but black oil painting cracks more than other colours. I think it is common to mix black colour with a bit of dark blue to avoid excessive cracking. That could be a potential explanation.

[BurningFrog]

A next step could be to "restore" those cracks in the image, and get an image of how it looked when new.