Billoin, Charles (1813-69; Belgian)
Louise d’Orléans, reine des Belges
Lithograph
Acquired by 1894
Unidentified; present location unknown

Louise (1812-50) was a French princess who married Leopold I of Belgium in 1832: see now * Baugniet Leopold Prémier, roi des Belges {by 1894} Loc? [PR].

Billoin was a painter and printmaker who specialized in portraits of the European nobility of his day.

Refs.

NGV 1894, p.103 (V.Buvelot Gallery, 1st bay, no.67) 

For the sitter, see e.g. https://en.wikipedia.org/wiki/Louise_of_Orléans. For Billoin, see e.g. AKL 11 (1995), p.55; Bénézit 2, p.487; and  https://commons.wikimedia.org/wiki/Category:Charles_Billoin. Further examples, including portraits of other 19th-century European royals, may be found by Googling