I don't know where Harju is, but it certainly looks beatiful. I think there are a number of things that could be done to make the photo better. Firstly, the horizon isn't straight, so that needs straightening. Secondly the branch in the top left corner I think distracts the eye. Branches like that can frame a photo, but you need to have more of it up the side of the photo, otherwise it looks like it accidently crept in. Thirdly, I think the sky is overexposed and the foreground underexposed - you should try using neutral density graduated filters to try to balance the exposure - there is good guidance how to do this on this website. Finally, I think a lower viewpoint would have helped the composition. If you look at all of the good landscape photographson this website, the vast majority all have some sort of foreground interest to lead the eye in.
Hope this helps,