人間第一香 The most fragrant thing on Earth

競誇天下無雙艷，獨佔人間第一香。唐皮日休詩句，詠花王牡丹，壬午冬寫此自覺當之。
A Tang Dynasty poet wrote that the Earth holds nothing more beautiful or fragrant that a peony.
A similar sentiment applies to the subject of this painting.