Looking for a children’s book we used to get from public library. Dewey number in the 300s/fairy and folk tale section. The story involved a sea king’s daughter and a tea party? The end pages had a black line with color washes drawing of the sea princess (with crown/long wavy hair) riding a Great Dane type dog (with antenna.) Another illustration was an underwater scene with anemone and a glass palace. We read the book in the mid to late 90s. No idea when it was published. Do not think this was a mermaid tale. The artwork was subtle & lovely, not brash or cartoonish. Do not recall if there were other stories in the book.