Frank, this is your best piece to date. Top stuff. Any criticism would have to be very nit-picky indeed. Your fleshtones are top. I'd only add a little extreme highlight to the top of his forehead to 'round it off' a little more.
I'd also go back to this in a couple of weeks when the dust has died down and see what you think then.
Most importantly, I do hope you're happy with it yourself. You deserve to be. It's good stuff.