G'day mate
As a pano lover, this already gets extra marks ..however- you are asking for feedback
I have seen similar images over the yrs and the sitter is either located in the exact centre -or- on one of the thirds (you know about the artistic rule of thirds). You could try this here and see if it works
My other critique would be to zap the swimmer (black dot) across towards the right-side of the pano
Hope this helps
Phil