Degas was one of the first horse painters to use photographic references.

In this occasion photographic references were allowed to be used.

"We know artists use photographic references to get a likeness and contours," Mr. Sendler said.

He selected photographic references for color keys, and during the production gave notes on contrast, saturation, depth of field and light intensity.

Do make sure that all this material is filed in such a way that it is easy to find and is related to any photographic or other reference.

After his death, his ex-wife Sharon came across a foot locker plated in 24k gold leaf, which allegedly contained photographic references of his "private work".

He will use photographic reference when appropriate, as when he draws things that he is not accustomed to.

When sketching figures, he will sometimes use photographic reference, and incorporate the photos directly into his sketches during the process of finalizing a layout.

Drawing from life is often preferred over photographic reference as it allows the artist to view the model from multiple angles and without distortion of the lens or lighting.

He does not work to set motifs, but makes paintings and drawings from observation and photographic reference.