Well done. Nice breadth, good picture. It's has good "portraitness" which means, to me, that it creates in me the sense that I "know" him a little bit.
My only quibble is that grandpa's face doesn't seem as important as the lamp parts upper left.
It doesn't read 'dark and moody' to me, but more 'grumpy.' He looks grumpy. Which means I like him. And he's totally rocking those light socks and dark loafers.