If you take down the brightness all the way, you see that a band of "golden" specks goes over the tower. So whether it's paint or an artifact of the lighting technique used for the scans, I guess we can safely say that it's not an artistic highlight specifically for the tower.
Although on the other hand, whatever it is appears more concentrated on that one spot of the spire...
Although on the other hand, whatever it is appears more concentrated on that one spot of the spire...