I would have re-framed this image with the tree closer to the right and with less ground in the foreground so that more of the canopy was included and so that the swing wouldn't be so centered.
I like this. One suggestion: I think the dead-centered subject feels a little stiff and formal for an image that's about being relaxed. Perhaps an off-centered crop (with wider aspect-ratio)?
This definitely needs a person to put it over the top. It is well exposed with a good composition. But a person unwinding would have pumped it up yby proviiding a nice pop of color and added interest IMHO.