It's spelled Quetzalcoatl actually (last two letters are swapped) and IIRC it's (roughly and psuedo-phonetically) kweh-tsahl-koh-at-el, but wikipedia suggests the 'w' sound is missing, so it's sort of like ketsa-co-attle. I've pronounced it the first way all my life, so I suppose I've been doing it wrong. Learn something new every day.
By the way, the piece is gorgeous. I love the colors and the exquisite balance.
I LOVE this piece, I adore art based off gods because of the artistic freedoms you can take with them. This is no exception, the Jaguar god looks the part of a hunter and I can appreciate not making the feathered serpent anthromorphic . Great piece.