H.R.H. The Princess Louise.
<p>Oval portrait vignette of <a href="https://en.wikipedia.org/wiki/Princess_Louise,_Duchess_of_Argyll" class="extiw" title="w:Princess Louise, Duchess of Argyll">Princess Louise</a> of about 1870.
315 x 255 mm oval, inscribed "H.R.H. The Princess Louise".
Lithograph with hand colouring<a rel="nofollow" class="external autonumber" href="https://www.britishmuseum.org/collection/object/P_1902-1011-10594">[1]</a>
claimed to be after <a href="https://en.wikipedia.org/wiki/Sergey_Lvovich_Levitsky" class="extiw" title="w:Sergey Lvovich Levitsky">Sergey Lvovich Levitsky</a> photograph of 1868<a rel="nofollow" class="external autonumber" href="https://www.rct.uk/collection/search#/1/collection/2901966/princess-louise-august-1868-in-portraits-of-royal-children-vol-12-1868">[2]</a>.
</p>
Colour adjusted by uploader
Unknown lithographer based on 1868 photograph by <a href="https://en.wikipedia.org/wiki/Sergey_Lvovich_Levitsky" class="extiw" title="w:Sergey Lvovich Levitsky">Sergey Lvovich Levitsky</a> 1819 – 1898
1870
<a rel="nofollow" class="external free" href="https://www.britishmuseum.org/collection/object/P_1902-1011-10594">https://www.britishmuseum.org/collection/object/P_1902-1011-10594</a>