Principles of Design

Balance: The balance is good. It looks like a straight-angled photo. The main focus is on the lake/river, so even though the trees are lopsided, they're okay.

Proportion: The lake/river looks relatively smaller than most... But maybe that's supposed to be like that. If the photographer is trying to emphasize the lake/river, he's doing pretty good. If he or she is trying to emphasize the little house - or boat house - in the background, they're doing a pretty bad job with that.

Rhythm: The photo looks like it would be in the category of "Flowing Rhythm". The lake/river  looks like it could be moving, but it also has a serene habitat-ish look. It looks like something is moving in the background, but you don't notice that right off-the-bat.

Emphasis: The photographer is using variations of green, in which they are using "Contrast of Color". They are also emphasizing the size of the lake/river.

Unity: If the picture wasn't so bright I would like it more. But the consistency of color is good. They kept using the green and blues and used that as an advantage.