In rave cases, if the sun be behind the observer, the distant land may catch a powerful ray of sunlight, whilst the clouds overhanging it may remain … - Alfred Horsley Hinton

It must ever be borne in mind that the prime object of all fine arts is to please through some or other of the emotions which it stirs.

There is a difference in printing greater depth to any portion with the negative and shading down without the negative. In the former case we get a deeper and stronger image, still preserving to a great extent the relative contrasts between the lights and shades in that portion. This is not always what we require. In order to concentrate attention upon that is, to emphasize, some particular spot, it may be desirable to shade down and flatten some portion.

...he (a photographer) forgets that unless he has learnt when the tones of a picture are right or not, he will not know whether his work is good or bad, nor know what to try and overcome in future.