Birds of a Flowering Branch, Watanabe Seitei
In the collection of the Metropolitan Museum of Art. Use zoom or download icons below the image.
Roughly 14×11 inches (36x27cm), ink and color on silk. The listing doesn’t say what kind of “color”. The white flowers look to me like opaque watercolor, but I don’t know.
The museum lists the piece as an album leaf, and there are links to similar works by the same artist at the bottom of the page.