The toning suits the shot, adds to the lazy feel of park-life.
I think it is framed a bit tight.
Getting the bottom of the seat in might be better and a bit more around the dog, even if it’s owner is not included.
i thought this myself with the crop, unfortunetly i only really noticed it when i got back to pc, was shot a 300mm so it was all or nothing. but sepia is nice for lazy boy…. “)