She lived in the age of photography, but also had painted portraits made. Her favorite artist seems to have been Franz Xaver Winterhalter (1805-1873), who specialized in portraits of royalty and the social well-to-do.
Below are some portraits of her, most by Winterhalter. Many of the dates are speculative, though approximate, due to lack of information from Internet sources.
By Franz Xaver Winterhalter
Probably painted around the time she became Empress.
She had odd-looking eyes that challenged painters who wanted to paint flattering depictions.
This reminds me of 18th century paintings of French royalty in the countryside.
A profile view eliminated most of the eye problem.
Her son Louis, Prince Imperial, was killed by Zulus while serving as a British army officer.
Again, those eyes.