Conversation so far:
What was Peale's role in the American Revolution?
He also raised troops for the War of Independence and eventually gained the rank of captain in the Pennsylvania militia by 1776.
What military achievements did he have?
he painted portraits of American notables and visitors from overseas.
What else did Peale do during this war?
While in the field, he continued to paint, doing miniature portraits of various officers in the Continental Army.
Were these popular?
He produced enlarged versions of these in later years.
What was his famous piece?
he is probably best known for his portraits of George Washington.
Where were these displayed?
It is in the collection of the Philadelphia Museum of Art.
Does he have any other famous pieces?
he did portraits of scores of historic figures (such as James Varnum, Benjamin Franklin, John Hancock, Thomas Jefferson, and Alexander Hamilton).
Did he paint anything other than historic figures?
Peale produced altogether close to 60 portraits of Washington.
Did Washington like the paintings?
In January 2005, a full-length portrait of Washington at Princeton from 1779 sold for $21.3 million, setting a record for the highest price paid for an American portrait.

Question: What else is significant about his painting career?
Self-contained rewrite: In addition to setting the record for the highest price paid for an American portrait, what else is significant about Peale's painting career?