That is not only a great picture of William and Charles but it shows Charles leaning in to William, Charles maybe more vulnerable, William accepting the eventual mantle that will be his, and maybe truly understanding his dad had challenges growing up (kind of duty-bound parents, possibly icy, and not truly understanding him as a person, more of a role, IMO), and it just looks like William has accepted and made peace. The Middletons are a great influence and he chose well with Kate.
William has done internal work and it shows, maybe brought on by being a dad himself.
Do you think he calls her Catherine? Why do we all call her Kate? Was she really always Kate?
Now that I think on it, I believe I’ve only ever heard William refer to her as Catherine. I’m not sure I’ve heard him say Kate.
With regard to the picture of Wm. and his dad, it kind of humanizes them, doesn’t it. I mean, we see lots of pictures of them at events and even most of their “casual” pictures are just this side of formal - ie, Charles in a suit, posed just so. It’s nice to see this more playful interaction. Hats off to whoever thought it would be a good idea to make this photo public. Very nice choice.