As a general rule, therefore, the lights and shadows of clouds near the horizon are less vivid than in clouds higher up. Exceptions to this rough rul… - Alfred Horsley Hinton

Inferior as a mechanical printing method for ordinary photographic purposes, the gum process may for a time at least be regarded as standing apart for pictorial purposes, because the large amount of personal control which must be exercised before it can be said to show distinct advantages over other methods implies that the controlling hand must be guided by an artist that is, a man of such large instinctive artistic taste that one can hardly conceive that he would be able to produce a better result by painting, and without the use of photography at all, were he to devote the same skill and endeavour to the employment of brush or pencil, instead of photographic appliances.

The sky is as much an essential part of the picture as any other part of it, and indeed, in very many instances, constitutes the key-note and important feature of the whole idea.

Hence SELECTION in photography, or at least in landscape and some other branches of work, often takes the place of what in painting becomes voluntary COMPOSITION.