Hey, thank you all - a couple of great suggestions here!
The scene was inspired by my short visit to the Chiemsee in Bavaria just recently. There ain't no fisherhouses like this, but I don't care. This one looks quite good there, I just have to continue to model the scene further and make it look well integrated.
I agree that keeping the foreground rather flat and spiced with smaller features, maybe one sizeable feature or object to make it interesting. I like the thought of having a far view into the scene.
Definitely, TU, the tree line is a placeholder for something better, but your suggestion is very good anyway, to start the vegetation from camera to the tree line with some bushwork.
I also like the suggestion to keep a beach like shore in the foreground, and pile up rocks'n rubble further away. Some boats are a must, too.
At one point over the weekend I'll give it another shot. I will keep rendering the coming test renders at this quality I think, but definitely up quality for the final render.
Oh and lastly: yes this is postprocessed. I just can't get the same lighting rendered out otherwise. The aura around the house is a consequence of that, but I may be able to prevent this for the final version.
So long,
Frank