"Harry", 1881, although I wonder how they tell it's not 1887 instead? 11-year-old Maud or 17-year-old Maud; she was pretty good. https://www.rct.uk/collection/search...-head-with-ivy
I guess it shouldn't be such a surprise how many talented royal artists there are, considering they had the time, resources, training and encouragement.
I'm a bit surprised Queen Victoria acknowledged her as Harry, though.
Edit: on looking a little closer, I wonder if it isn't intended as a self-portrait? Or at least with self as model?