Avoid any human or animal presence in the image, Avoid any signs of pollution, such as rubbish or litter, Avoid signs of destruction of nature - such as trees that have been cut down or felled, Avoid signs of natural deterioration, such as erosions or landslides, Avoid the appearance of fog, which could spoil the view of the beauty of the surrounding nature, Avoid the use of dull or bland colors which could diminish the level of wonder or admiration that one feels when looking at nature, Avoid any form of overloading of the image, which could harm its natural beauty, Avoid the effects of background sunlight or other climatic conditions which could give an image that is too artificial.