Shading practice

After my huge fail i practiced shading a little bit more. This ball is just a simple object. We have to determine the shape of shadows and from which direction the light is coming from. In future we have to draw more complicated objects. That's why we should pay more attention to the shadows of objects surrounding us. Just look at them and think; how long are they, in which shape are they, how dark are they, how can we draw them? I think this practice will be helpful in later drawings.