Balance- I think that the trees in this picture show the balance because they pretty much go all along the back.
Proportion- This picture has good proportion, i don't think anything has the main focus you just see it all at once.
Rhythm- I think the rhythm in this picture comes from the water because you can kind of see the current/ flow of it if you look towards the back.
Emphasis- I think the focus in this picture is the water because its in the middle and you can see the reflection of everything in the picture in the water.
Unity- This picture is a very good example of unity because there are mainly the same 2 colors in the picture.