Anna Mason is an English botanical illustrator and watercolor artist.
She often works at a relatively large scale, and her paintings have an appealing blend of detail, texture and color.
Mason is self-taught, and only 18 months after beginning botanical painting, won a Royal Horticulture Society medal for botanical arts for a sequence of 20 paintings of an apple tree branch progressing through the season from bud to blossom to fruit.
She now offers a course on watercolor painting, in which she introduces her techniques to others. She also has a book, The Modern Flower Painter (preview here), and a series of free instructional demos on her YouTube channel.
Some of her pieces are deliberately high-chroma and have something of a pop sensibility, but I prefer her more subdued and naturalistic representations of botanical forms.
(You may find older references to her work online under the name of “Anna Knights”.)