Found this as Alexandra Iosifovna as a young girl, by Joseph Karl Stieler, 1840s. Anyone can confirm?
No, she is not. If you look at the right side (near to the girl's shoulder), you can see that the painting wasn't done by Karl Stieler but by "F. Krepp". The year is also there, in the artist's signature: 853, not 1840's.
Later I googled the painter's name and found it labeled as "
Portrait of a young woman with roses in her hair (1853). Friedrich Krepp".
Here is a link to the description. It fits better to the information provided in the signature. Anyways, very beautiful painting!! ; )