Watercolors of interiors in Saxe-Coburg and Gotha, done by the German artist Ferdinand Rothbart. There was a fashion for having watercolorists do portraits of your drawing room, back then. The Russian tsar had a lot of them, too.

Gotha Winterpalais Balkonzimmer 1848. Saxe-Coburg and Gotha (German). In the public domain in the United States because the artist died over 100 years ago. via https://commons.wikimedia.org/wiki/File:Balkonzimmer.jpg
A so called “Zimmerbild” (chamber painting) of a bedroom in Coburg, Saxe-Coburg and Gotha (Germany). ca. 1848. German. Scanned from “Biedermeier. Die Erfindung der Einfachheit”, a catalogue of an exhibition.. In the public domain in the United States because the artist died over 100 years ago. via https://commons.wikimedia.org/wiki/File:Zimmerbild_99.jpg
Gotha Winterpalais Frühstückszimmer (Breakfast room in the Winter Palace, Saxe-Coburg and Gotha. 1848. German. In the public domain in the United States because the artist died over 100 years ago. via https://commons.wikimedia.org/wiki/File:Fr%C3%BChst%C3%BCckszimmer.jpg
Coburg: interior of the Landestheater,” the Queen and her party are seen about to enter the royal box in the recently opened theatre, to attend a performance of Meyerbeer’s “Les Huguenots”. Sace-Coburg and Gotha. ca. 1845. German. © Royal Collection Trust. Fair use license. via https://www.rct.uk/collection/920477/coburg-interior-of-the-theatre

Rothbart did many commissions for Queen Victoria. These could be part of that as she commissioned a set of Prince Albert’s childhood home, or they could have been commissioned by her brother in law. The theatre watercolor was for Queen Victoria. The others don’t say.