I don't really know too much about the composition or technical side of this but, I absolutely love it. I could sit here all day and stare at it. Makes me feel really calm-- and I am a pretty anxious person.
Beautiful composition. The placement of the fisherman in your framing is perfect. The water is great, especially the reflections. I think it forms a great leading line bringing the eye to the fisherman. I have to agree, the sky looks a little washed out, especially compared to it's wonderful reflection in the water. A trick you could try in editing if you wanted, and of course depending on what you use, is selecting just the sky, pick out a nice blue for foreground color and apply a gradient, set on foreground to transparent, then drop the opacity til it looks right. Just have to watch and make sure it still matches the reflection.
Lovely!! But...I think it is just a little bit too tall. I would crop a little off the top to include just the reflection of the trees and not the trees themselves, which really focuses the viewers eye on the fly fisherman.
Fantastic clarity and colors in the reflection. I think the sky needs to be bumped up though and a little more light on the foreground. Great composition.
EDIT - and I don't care for the border on this one. (Sorry)
If you feel crazy one day and want to go insane editing... have you thought about desaturating everything but the fisher, and bumping the contrast a LOT? May not look too good, though. Just an idea.
A deeper blue in the sky would be nice b/c I think it looks pretty washed out, as well as the tops of the trees. The reflection colors on the water look great. I'd also suggest that you maybe clone out a little of that grass that kind of sticks out right before you picture title (a little to the left of the 'FLY').