Jean-Marc Nattier, "Anne-Henriette, Bass Viol"

Jean-Marc Nattier, "Anne-Henriette of France, Known as Madame Henriette, Playing the Bass Viol, 1754; Chateau de Versailles.

Traditional paintings from previous centuries are difficult to duplicate, due to the extensive and painstaking detail involved. Realism was very important to these artists, so their originals usually look very natural in terms of flesh tones, scenery, sky, clouds, interior woodwork, clothing, and so forth. If a person's skin doesn't seem life-like, or if other colors appear heightened or flattened out (all one color), the image is probably either a poor modern copy or a highly processed digital photo, as shown in the commonly shared image below. Note that the revised version also is missing some of the painting at the top and right side. The photo above is from the website of the Palace of Versailles, where Nattier's Madame Henriette is located.

Altered detail of a painting by Jean-Marc Nattier.