This is so cool. But requires art skills and truly labor intensive.
Reminds me a recent thread about "Molds and copyright ". If using Disney or Pixar mold are getting banned and bashed, why no one says anything about this creative soap maker?
Copyright covers 100 or so years after the creator has died, that's why a few years ago everyone seemed to be rewriting Jane Austin's books - I think she died around 1905. If I remember right, most of the artists in the article died before 1900.
ETA: Even if a painting is not copyrighted, and the two above mostly likely are, museums may also hold copyright for images in their collections, as do some private collectors.
Another edit: Different countries have different copyright after death laws. And apparently Edvard Munch's paintings are in the Public Domain now. Explained here.