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Posting without the full EXIF data, especially the color space limits how we can critique. In this case it forces me to guess the color space you intended, which may seriously compromise my critique.
Using my best guess at how you intend the colors to be displayed, over-all it has a small red/magenta cast which for some reason is quite common for digital captures. The color of his lips seems a odd for some reason. Could be lighting or post processing, assuming no make-up was used.
Beyond color issues, the fill light is very flat. That is a good choice for a female subject, especially after the blush of youth begins to fade, but it's rarely ideal for typical male subjects, as it's perceived as feminizing.
In terms of posing, the relaxed informality is good, but beware of posing a subject with his chin pulled down that causes a gathering of flesh under his chin. Head/chin/neck angles are critical to a flattering pose.
The brightness and color contrast of the tree on the right is unfortunate because it tends to draw the eye away from the subject, as you've mentioned. If the background doesn't allow you to reframe to avoid the tree, you can re-crop in the camera to remove/reduce the distraction. Failing that, it may be best to find another setting.
In terms of post-processing, you can re-crop, change the colors, lighting contrast, and at least do some reshaping of the flesh under his chin. An example with post processing changes for your consideration, illustrated with PS5: