Why do you think religious scenes were such a common subject matter for artists to use in etchings and intaglio prints? Why does this medium lend itself to the subject matter?

The first answer is that it was such a huge influence back in the day that provided such good scenes that it was perfect for artists. The second answer is the medium was good for still images and scenes.

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artists need to create a realistic interpretation so that people in general can relate to the artwork. for a common people, an artist's impression gets increased only if he can create something which would look realistic. an abstract is difficult for a common people to understand whereas if a person can draw a girl with simple pencil sketch and if that looks like a real figure then the latter will be praised more than the former.