Before I started on the drawing for this tutorial, the first thing I did was set up a lamp pointing at my still life from just a few feet away. I also turned off all the other lights in the room to increase contrast and clarify each shadow.
It’s extremely important to make good lighting for yourself when you’re drawing indoors. If you don’t have that strong directional light, you won’t be able to see the shadows and highlights and your drawing will most likely turn out gray and visually flat.