The reflection on the lake

Reflection of a point source off a flat surface should give a pointlike image. Thus, when we look at mirrors we see clear images. These are snapshots of the Copenhagen lakes taken on February 15 and 16. The reflection is not perfect, the image is much larger and extended than the source... Can you describe what is going on, and tell something about the surface of the lake? If you're able to explain this, you'll get a Strong coffee or beer! Submit your solution here.