Wilson, perhaps in the situation at Mai Po you could put a comment along the lines of 'Photo of bird near nest visible from publicly-accessible hide'.
I think it could be useful to know that you were not disturbing the bird, particularly for a species such as Greater Painted-snipe - photographing this species at/near the nest at MP would be very different from photographing a nest of the same species at Long Valley, where there is a much higher risk of disturbance.
Overall I agree with Geoff's suggestion. I don't disagree with these activities in moderation, but it is important that they are not having a negative impact.
