Hey there! I see that you're applying warm light/cool shadows (and vice versa), which is a good principle to think about in these studies. Though taking a closer look at the original images, you'll still see this principle being applied, but to a lesser extreme. For example, on the old man, his shadows appear actually more purple/pink. They aren't fully desaturated and cool, but they are still cooler than the base warm tone. Another quick tip, for the black and white image, this is a great way to study the reflectivity of objects. Something metallic, like in this example, has much higher contrast with bright highlights and dark shadows. You show a lot of thought and great choices throughout the assignment, I hope you find these tips useful. Keep up the good work :)

Good job! The only thing I would look over is the value of the top plane of the cube shape. It seems a little too dark.