Is there anything "wrong" with this picture, apart from being exposed a little on the bright side? No not really, the fly fisher is positioned in textbook manner, movement of the rod and tackle is in the direction of maximum headroom within the frame, and the angle of view is giving a nice overview of the scenere. So far so good.
Yet, it does not engage me. Why? It simply feels so remote and detached, the 'man against nature' theme almost like an afterthought, and the overall effect is defocused.
Improvements could be making the image tell a more readable story by moving closer (not necessarily by foot, a tighter crop suffices), making sure the elements within the frame all are important and adds to the total strength, and focused so as to lead the eye into the frame with fluidity.
I envision this could function well in a cinematic setting as a quick opening of a scene then the camera suddenly moves to a tight shot of the fisherman himself to swoop down seeing the river from his vantage level. Thus, seen in such a context, the present image functions as a window into the scene, but not equally well as the scene itself. It is sequential but we don't see the next step(s).
Don't know if the above makes much of a sense. I wrote in a stream-of-consciousness state of mind.