Hi Ross

He's a handsome chap - a rival for my Grandad Harry, I think! You should make him your avatar, the Rootschat ladies will be swooning over him in no time

In answer to your question about the painted clothes, yes, it was very commonly done as early enlargements (around the 1890/1920 period) were not very clear, so overdrawing or overpainting (either in black and white or colour) were done to bring out the details. Sometimes they were a bit "overdone" - I think in your grandfather's case they've gone a bit heavy on his waistcoat and jacket, but thankfully they've left his face mostly alone except for a bit of retouching about the eyes.
There does look to be some silvering out on his jacket, but whether that's from the original or the copy I can't tell.
Cheers
Prue