How can the LTV explain the price of art?

2 artists paint a picture, it takes both of them 10 hours. The better artist's painting goes for 5000$ , the other goes for 500$. How do you explain that in through a Marxist lens? Assume the same amount of schooling, one is just naturally a better artist.

I'm midway through the first chapter of Capital, that's why I'm asking. Thanks. This is the greatest Sub ever