Susan Sidlauskas at Rutgers, Christiane Hertel and Steven Levine at Bryn Mawr, June Hargrove at University of Maryland, and Elizabeth Childs at Washington University in St. Louis are all 19thc. European scholars who have done/are doing some fantastic work.
You probably already know this, but it is important to note that even within 19th c. European art, there are many different possible research areas. These programs are going to want to see if you have more specific focused areas of interest within this period, especially for a PhD. The scholars on your list may have different (perhaps even conflicting) approaches, methodologies, preferred topics of research. When you reach out to your various PoIs and when you write your SoPs, make sure to adapt your essay for each program to present yourself as best a match as possible.
I hope this made sense. Feel free to ask me any more questions...Good Luck!