You are on a good direction in this image. I like strong silhouettes of trees without large areas of black. Here and if possible, moving to include less of the background land would have strengthened the silhouette even more. I like the combination of sky and water BG as well as it does not compete with the tree's outline.
I feel you framed the tree well as the pattern of branches are interesting.
Hi Kostas, I Like your basic concept of silouetting the trees and shoreline. I attempted to show a different way of looking at it by eliminating the darker area on the lower right cropping some off the top and bottom. This takes away some of the business and makes the tree on the right more dominant. After looking at the repost I might even take a bit more off the top. Another idea....