>>7687365
try putting the photo in a 'cutout' filter or similar to simplify the shapes and group the values for you. this can help point out what went wrong when you tried to simplify all the details in the photo. or like you said, studying from a painting can be good as well. since the artist has already simplified it for you. just don't rely on it too much because we want to develop the skills to do this ourselves.
https://www.proko.com/values