Some possibilities include professional, experienced, seasoned, knowledgeable or simply experienced.

In your case I would go with’seasoned’ as it forms a neat collocation: Several

exhibitions are devoted to seasoned artists. I would’save’ a few more to finish the piece.

Artist Mr. Barry is a seasoned artist with hundreds of exhibitions under his belt.

Why dancers don’t start groups before they are seasoned? They’re starting new companies as an

artist.