I very much like the idea of a uniform algorithm for this - similarly to https://indieweb.org/post-type-discovery. During that session the list on https://spdx.org/licenses/ came up as a source for licence indication - unfortunately neither rel=“licence” nor microformats seem to be offering a way to indicate a machine readable licence indicator yet. It might be beneficial to include a proposition for that along with the algorithm.

On my attempt to re-create a photo I mistakenly shoot as video, and therefore only have it in a small resolution¹ I got up early on my second that at our visit to Stara Wieś as well. No rain, no sleet, but lovely sunshine. And cold. And wavy water surfaces. So, unfortunately, I wasn’t able to re-shot the image at a decent resolution, but at least I found another perspective to show the surroundings of the tea house.