It's no wonder. It is a beautiful still life. GREAT Vermeer-ish light. Well done and congrats on selling it. I hope you charged a meellion buckaroonies.
Not so much a glow but just a different look and the finish is almost like velvet. You treat the copper with garlic before painting and it makes the paint adhere better but it is a build up process. here is another copper painting.
Thanks Arty. Yes, garlic reacts with the copper and gives it a tooth. Did you know that many of Rembrandt's paintings were painted on copper? It stands the challenges of time.