I'm from the republic of Ireland, not the north. But these guys aren't looking too.... Irish to me. They're all a bit too........ beautiful :S They look a bit spanish or european at least. And maybe a little generic. Not much character in them. Irish people, especially up north are practically spewing character, mainly from the accent I guess. But maybe you should look at a few pictures of Cillian Murphy, Dermot Morgan or Colin Farrel, Shane McGowan even [link] .... okay maybe a little too much character
Thats my critique, I dunno if you're up for working on this further though They're looking pretty realistic I have to say, and all have individual features. So nice job on that.