Originally posted by Schraubstock It is all wrong !
Not your photograph, that is fine.
The painter's choice of canvas size; utterly inappropriate format for this sort of motive. So I don't think he is a professional.
Greetings
That rather depends on what the artist's vision tells them, doesn't it? Photographers can crop in post, of course, but the masters of landscape photography have used all sorts of formats/aspect ratios, from square to 4x5 to 6x7 to 2x3, and now 9x16!
Anyway, what's a professional? The general rule of thumb these days is anyone who can sell their output. Academics and others will tell you it's someone who professes a body of knowledge. Take your pick (personally, I think both apply).
The more I look at your photo, the more I like the compression of the longer FL. I think, though, it would benefit from some post-processing to bring out the layering of the hills, more. I had wondered if the painter might have been positioned differently (as in Rule of Thirds, for example) but I like the tension created by the fact that he appears to be seated right on the edge of a steep drop, and placing him near the edge of the frame I think assists that.