I understand why you chose the strong gradation, but I still find it a pity you clipped off his chin.
Anyhow, dementia is a sad thing to witness, it leaves you behind feeling all helpless, but when my severely demented uncle was still alive and I mentioned the radio he had once built with us when I was little and he was young and able, something changed in his eyes. A flicker, a moment of focussing, as if it meant something to him. That gave me a good feeling.
It was no longer possible to take any photos of my uncle in the latest stages of his dementia, or better said: to show them to anyone but family ... well, he's in a better world now.