I liked that the gallery page displayed the full images, but I thought the name was a little misleading. As a user, I would go to the gallery page to view all the artworks available, but this gallery page only has one artwork per artist.
I think that an Artists from Vietnam page is necessary, but that should be a separate page that the user would go to if he wanted to learn more about each artist. In my redesign, the gallery page will be completely focused on the artwork, allowing the user to view each one in detail without any distractions.