[Tom Martinez]

No, Rochelle, you seem to have missed the point of everyone's comments. In essence, you have done an excellent job in copying a photograph (a two-dimensional picture). In doing a drawing, the artist is attempting to perform the task of making the two-dimensional object to look three-dimensional. It is your edges and values in the drawing that do this. When two surfaces appear to overlap each other, they form an edge. Based on the values of those surfaces, the edge will appear to be hard, soft or non-existent. When the values and tones of the surfaces are the same, the edge blends in with them.

So, the drawing is near perfect as far as producing a copy. However, if you wish to give it some volume, you will have to make some of the edges darker, lighter or even disappear where the values call for it. You can add some background. I would suggest just a hint by doing a light outline of something in the background. I wouldn't overdo it.