Stormblood paintings, I know at least, unlock in batches. So the initial Stormblood sightseeing log unlocks the bulk of the paintings, but the log was expanded in a patch since the expansion, and it will take registering those in order to unlock all the paintings from that batch. So you do have to get to the top of the Kugane tower to unlock the first batch, but do not have to get the one on the lamppost, that is only required for the second batch of Stormblood paintings.