I don’t mind the rise on the jeans, though I would prefer a proper shirt over a polo shirt and would keep the collar tucked under the jacket in either case.
Also I find the flashy red pocket square a little incoherent. I’d go with something lighter and more in harmony with the overall colour palette you’ve got going on there. Perhaps cream linen with brown dots or anything else more subdued if you own it.
I do like me them unpadded LBM summer jackets though, I have a few and wouldn’t mind brown:)