it's a little flat. good beginning but looks unfinished. You need darker darks and lighter lights. Higher contrast pops the picture out of the paper into an illusion of 3D space.
I see that the darks are not "as dark" as they could be... but the lights are white -- no matter, you are absolutely correct about how contrast can "pop" an image and create the illusion of depth and volume (3d- space)
thank you!