I have a very drawing, I love the fact that you started the drawing by first drawing out the shapes which is the best way to go but then, the only issue here is your shading, you need to map out the areas where you shouldn't shade at all, you can't have the whole of your orange shaded out.

At a look at this stage of my drawing, I was done with the drawing already at this stage and you could see that I still have some parts of the orange that I didn't cover up with shading because that is where the light falls on on the orange and I just have to leave it blank like that in order to achieve a very fine and interesting contrast in my drawing.

Do you understand better now?