Very nice work. The first man's chin and neck seem to be a bit narrower than they actually are in the photo, but not bad just the same. The other three are very nice. As for the portrait of you, I find it kind of strange that the photo itself is fuzzy and somehow you've conveyed that to the portrait. I think this is what some of the others are saying you have to watch for when using a photo reference. All in all though, nice work.
On a side note to cucaracha, I think you're missing a once in a lifetime opportunity by not drawing the 2999 old people in your town. Old people have the stories of life imprinted on their faces. What a great advantage you're missing!
Art gives me a life of extreme challenge, frustration, accomplishment and contentment. Nothing less will do!