Integrate the stub material into the main article. There's some good stuff in there that would benefit your text.
Re-check your organization. For example, why is the information about Augustus the Strong in the Artwork section rather than the History section? Porcelain manufacture seems like a major part of the castle's history, after all.
Cite Everything ☺. You appear to have the sources; they're just not attached directly to the material they supplied.
