Lines have expression, and by the use of lines alone we can suggest impressions. - Arthur Hammond

There should be no very violent contrasts and no spottiness of light and shade, and, above all, the tones must be right.

...the accuracy of the lens is often regarded as infallible, whereas, from the artistic standpoint, a lens is less accurate than the trained eye.

For outdoor work, landscape and marine pictures, a long-focus lens is usually more satisfactory, because with it we can more easily isolate and emphasize the principal object of interest, and make it large enough without having to get too close.