It's overall quite a snappy look. There are such things as StyleForum nit-picks...which I will not go into here. But even to a casual observer, your shirt cuffs are WAAAAAY too long....so long, I can't even see where the suit sleeves should land.
As I appreciate the fact that you have the "inseam" to show off a three-piece, I do have to ask what occasion it is for. There are some business situations where it would definitely not be a good idea to wear it.
(1) You're right about the shirt, of course. This was quite hastily put together. Independently of that problem I've also put on a small amount of weight in my middle since I bought this suit about five years ago, so the fit in that area is a bit worse than it used to be.
(2) You wrote: "I do have to ask what occasion it is for. There are some business situations where it would definitely not be a good idea to wear it"
I'm a university professor. That's what I wore to work yesterday. It's pretty typical for me, actually, especially on days when I'm lecturing. Took the photos once I got home yesterday (one reason why there's less natural light than I would have liked).
You're quite astute to ask about the context, which isn't always considered, and I'm glad that you did. That's why I don't wear a pocket square. I like them and would love to wear them, but they would be out of bounds on my campus. I'm not sure that even my tenure could save me if I wore one ...
My sincere thanks for taking the time to comment. It's very much appreciated.