Wikipedia has a copy of the frontispiece of Wheatley’s Poetry Book picturing her at a desk, quill in hand. Project Gutenberg has a free copy of the book. The Public Domain Review has an essay about the poet, including another portrait of Wheatley in evening dress.
Note that while the USA claims Wheatley as the first female African American published poet, she is also the first female black African published poet. There is a blue plaque for Wheatley at 9 Aldgate High St, the site of her first publishers’s offices. The plaque reads: On this site in September 1773 A.Bell Booksellers published a volume of poems by Phillis Wheatley 1753-1784 the first work of an African American female writer published in English.
Wikipedia and The Poetry Foundation have biographies of Wheatley which include more detail of her later life. The menagerie at The Tower of London has been called ‘London’s First Zoo.