This image kicks off the "quick curves" section of the class, where any and all, including non class members, are free to participate, or just watch.
Shadow, highlight, and neutral will go far with this image. More advanced students might use the hue clock to look for any unnatural hues that remain, remembering that chocolate is a deep shade of orange.
You are welcome to sit back and see what others do, or try your hand at fixing this image, with curvemeister or any other tools you prefer.