Every male tennis star seems to have a beautiful girlfriend or wife cheering him on from the visitor's box, and the Scot Andy Murray is no different. Kimberly Sears looks pleased when Murray hits a winner and hang-dog when he shanks a ball, and she is beautiful. One more thing about her, she also paints portraits of dogs and cats.
When artists agree to be represented by a gallery, they usually work out with the gallery owner -- formally or informally -- the terms of their understanding. One expectation, which may or may not be stated explicitly, is that the dealer will keep track of the artist's work even after it has been sold.
There are many reasons for and against making one's own paints. On the pro side, the cost of purchasing the components in artists' paints add up to considerably less money than the price of buying commercially available tubes, plus the fact that those who make their own usually buy in bulk, which increases the savings.