Every line in this photograph points right dead to the center, where the man in the boat forms a wonderful bullseye. While the textbooks would probably say offhand to avoid this, I think in the back of the chapter they'd also remind you you should know when to break the rules. This, therefore, I would regard as one of the good rule breakers. The centered subject lends to a sense of stillness, quiet, solitude, and ultimate peace. This calms the nerves and pacifies the restless mind.
I totally agree with Chris and partly with joBLUE. To reach absolute perfection I think the lake and boat should be lighter compared with the sky. Clearly the camera's meter has exposed for the light sky. This way it seems to me the sky shows daytime and the lake and boat dusk. Lightening the lake or darkening the sky would both be good solutions. What do you think, leeroboo22 ?
With all respect, soender