Hey man nice greyscale! what I love the most is your story telling. Many forget to tell a story with their picture, even though it's such an important element (even the most important).
I made a little edit on it if it's okay with you. imgur.com/a/2DzN0
The lamp is the perfect light source! You can use it to be your main focus, and set a nice mood. really creates a contrast.
For future works, you can for sure work with gray scales. But if you wanna try to give it some color, try using blue. Light blue, to dark blue, to dark dark blue. Never use pure white or pure black in an image. It almost never appears in life.