There could be lots of reasons for the rejection, which will be for a property release rather than a model release. Each site has its own guidelines, some of which are stricter than the law in the country concerned. Basically, it's their ball. If you post the images, someone might be able to guide you.
For example, some sites might accept the harbour image, but you'd have to take off all names/numbers etc from the boats.
Otherwise, some files might be better suited to editorial use only.