Never met the queen so cannot be sure about this; her eyes seem fine but the mouth looks all wrong to me. And it is not accurate as regards her age.
He should have stuck with the Holga.
Maybe not his finest portrait but it is certainly a different portrait of her - it looks like his 'charm' got to her! And yes, that is the the negative mask.
It turned into a nice old lady, didn't it? Nothing more, nothing less. Like a nice old lady I know down the street. Nothing wrong in it really, but I know a lot of folks here who could have done just as good. Once you have a name, well......
I have been unable to make my mind up about this one. I can see where it would be a challenge, the Queen is probably the most iconic person on the planet and one does has to remain dignified. I guess this kind of limited what he could have done.