pentimento
alteration in a painting, evidenced by traces of previous work, showing that the artist has changed their mind as to the composition during the process of painting
en-GB/ˌpɛntɪˈmɛntəʊ/
en-US/ˌpɛntɪˈmɛntoʊ/
alteration in a painting, evidenced by traces of previous work, showing that the artist has changed their mind as to the composition during the process of painting