Generally speaking it is not frown upon in showing your photo in someone else's post as long as it is related. What is frowned upon is making a new post with an Non-R-series camera EXCEPT in Non-R section located:
here.
Take this opinion with a Grain of Salt because I'm new here as well and not part of Admin.
Side question, your photo looks like the Washington side of the Columbia River out past the Dalles.