Watermarking is just an example of disparate rules that make the international phase not equal for every country. Besides the watermarking issue (personally I see it as the less severe issue), there should be a common set of rules for all the countries contesting. As I've told previously, there are pictures that do not belong to a monument at all, countries posting more than ten pictures or providing images of elements of movable heritage (when the remaining countries only consider immovable heritage items). Unless the same rules apply to every country (for providing images for the international phase) the international contest is definitely flawed (again, it's up to each country organization to set the rules for the national contests, however, the international one should follow a single set of common rules).