Hi all clever technical and knowledgable people

This is a photo of my Great Grandfather William Satchwell, I have no idea when it was taken but it looks like it was taken outside. He was an 'Ag Lab' I know that much from the census - but he doesn't look a barrel of laughs does he?

He was born in 1857, but apart from this photo and possibly one other I know very little about him.
Any insight much appreciated.
L12