Nice work, but I agree, your edges do need some work. It's not that they are really bad, it's just that a lot of them are soft, or blurry. Maybe some harder edges or areas of sharper contrast would help you out.
A few reccomendations for a couple of comps; try getting the focal point and rhythm to be more clear. In that lake with the mountains and the waterfall, the focal mountain points upwards very severely, leading the viewers eyes upwards to nowhere and killing the rhythm of it. Even a slight tilt to the angle of the top of the mountain will make it look better. For the first image of post 24, there is too much space on the top, and like the last pic I critiqued; the trees point upwards yet there is nothing there except for a few transparent clouds.
Other than that, keep them coming, the comps are nice!!!