339571
Vernon engraved for Samuel Carter Hall 's " Royal Gallery of Art , Ancient and Modern " : Dyce 's Virgin Mother , Winterhalter 's portrait of Princess Helena as an amazon , and two other plates .
 Vernon, Samuel Carter Hall 's, Dyce 's, Winterhalter 's, Princess Helena
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vernon, Samuel Carter Hall 's, Dyce 's, Winterhalter 's, Princess Helena