Portrait of blonde girl with green dress. Signed and Dated 1851.

Portrait of blonde girl with green dress.
Technique: watercolor and pencil on painter's cardboard.

Size: cm 21x16.
Partially legible signature (a female name appears) on the right edge in the center.
Dated 1851.
Girl with Nordic features: blue eyes, very light blond hair. She is wearing a thin black voile and a checked tie/scarf.
And she is sitting on an armchair with an evident Louis Philippe style.
There are some imperfections, clearly visible on the photo.