Howdy folks! As you can see, I've been working out the values of the image, determining where the light source is and which part of the image is least important. If everything in your painting is the same value, then the eye has a hard time figuring out where it should look, more importantly, where you would like the viewer to look. So, the bottom of his robe and his rear arm are obscured.
This focuses the eye on the skeleton's face (and that dude needs to try decaf, I mean for real), and his not so blunt butter knife. I mean, come on, all he plans to do with that thing is spread some butter on his toast.