Google the artist and discover his works sold at auctions such as Artnet.com. No clue if this particular piece was reproduced. Mr. Goose passed away in 2001 from what I read. Alternatively, you can comment on the article and ask the designer where she sourced the piece. Might have been a gallery selling his work or might have already belonged to the homeowner. The gallery might have other works of his you might appreciate. Btw, you’re posting to a user forum made up of decorating amateurs and pros, not writing to Houzz staff directly. :) Hope you find something to your taste. That is gorgeous art in a gorgeous room!

https://www.perigold.com/Soicher-Marin--Chrysanth-Print-TW0159B-L1318-K~WJZ1367.html?refid=PINTO457-WJZ1367 https://society6.com/product/botanical-collection-dahlia-flower_print?sku=s6-8576060p4a1v3 Dahlai Brint https://www.redbubble.com/i/scarf/Cafe-au-Lait-Dahlia-Botanical-Illustration-in-Black-and-White-by-birdsongorchard/29300919.B15PI

I have no help to add about the art but I do love the colorful rug @celery showed I the last post. Something dramatic with that gorgeous green in it will tie the room together. Your dining table is stunning! And the green chairs are a happy surprise ( most dining rooms have all chairs the same).

I agree that the rug is much too small as well as dark. The tones are taking away from the distinct table base and the coordinating chair legs. As an admitted minimalist, I'd have no rug there or one that's the same color as the floor but textural. The floors are beautiful. Given the many hard reflective surfaces, I think a mirror would be too much and would prefer a textural art piece. The height can't be greater than what's there now due to the vent. Although I really like the candlestick lamps below, it may look cluttered due to the glass cabinet close to the sideboard.