Empress Frederick, aka Victoria of Prussia, the Princess Royal of Britain, was an accomplished painter. She painted portraits of her children that I didn't find online but in a catalogue about her life.
Her sister Louise, Duchess of Argyll, was an excellent sculptor. https://www.historyscotla...of-a-royal-artist-part-2/
She was the first British royal to visit an art academy and study art seriously.
The sculpture of her mother in coronation robes in front of Kensington Palace is her work.
The Duke of Edinburgh paints. I really like his landscape paintings, and the portrait of his wife by the breakfast table is lovely. https://www.rct.uk/collec...as-an-artist-and-designer
Lady Sarah Chatto, daughter of the late Princess Margaret and one of my all-time favorite royals, is a professional painter. https://www.redfern-gallery.com/exhibitions/16/
I love her still life paintings. She's excellent. Her husband is an artist, too, and teaches drawing iirc.
I would also suggest to look further into Alexandra, Empress of Russia, and her textile work. She was an accomplished needlewoman and I wish I'd see examples of her work. Textile art has suffered from neglect from art historians ("just a hobby for women"). Many women who had no other outlet for their expressive powers used their skills as needlewomen, and I have the feeling that Alix might well be one of them.
there is a strong streak of artistic talent in the family of Queen Victoria, herself a good water colourist.