I'm glad you took time for it and wrote this critique. But I cannot completely agree.
This guy is a little too old for knight, sure. But he is endowed with holy power so he dont need muscles. In my opinion that is the point.

And the beard ... so, if you could see my beard this look fake also, but still mine. :D  I think he feels the same way.
However, I understand your point of view and accept it.

Hm, he's a good-looking guy. I think the skinniness of the arm kind of undercuts the muscliness I'd expect from a knight, especially one with such thick boots. The beard also looks very fake on account of how low it is?