I don't really see the actors as the characters (although I can't imagine anyone else ever playing them). Dan's too small and Alan's too old. But I also don't want to see Adrian Brody Snape or any recognizable actor in their features when I look at art.
I pointed out in the LJ post that perhaps _odella_'s Noir (which I have here in my icon) is a good representation of how I see them. Obviously, that is an older Harry but generally speaking, yeah, something like that.