Not a particularly well lit (against the sun) or sharp shot. And he's a long way off. Saw this guy in our garden about a week ago looking very bloody, today he does look somewhat better. Obviously something got him. But I think he's going to survive.
I think what got your bird was avian pox.
Is that a joke? Obviously not I just googled it. I got another shot this afternoon and it is a growth of some sort.
Last time it was very bloody, now seems to have a crust.
Had another one in the garden a few years ago that had something similar growing out of one eye.
It got very tame when it realized that food could be had very easily. Hung around for at least 8 weeks.
Here's a better shot taken this afternoon: