Hi @Eyemer
This is interesting, but the composition is a bit frustrating for the viewer. The structure looks interesting but we don’t get much of a look at it. Almost 3/4 of the image is black - that may be a monitor issue on my end, but you may want to lighten it up a bit. It may be covering up a beautiful shoreline that leads the eye up to the tower. 
Hey thank you for your feedback
you are totally right, its way to dark.
But some how I thought it would look kind of natural, because the sun goes down behind the tower.
Yes, and you are right - but you might want to experiment with zooming in a bit. Keep the sun effect behind the tower but bring everything closer, and lower. This way the you eliminate the dead space in the lower part of the image and bring the focal point (the tower) closer and easier to understand.
There are some very good videos on composition out there. I’m constantly reviewing them myself. Here’s one to get you started.
Of course this is just my opinion. 
Ah thanks for the support!