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Here you have your light going on different directions. You did mostly keep to one direction of light, and that's good. Only your ground shadow really seems to have a different direction.

To keep it simple, for this image, what you're missing is cast shadows. Your cast shadows are dark and crisp, unlike the more blended (lighter for cell shading) levels of shade. Look for places where something blocks light from something else and make those shadows darkest.

Look at how the light is all even. Follow that direction from your object casting the shadow to the ground and you'll see about where you shadow would be.




Please see the post on light and value.

Lighting a figure is pretty much just putting together what you know about lighting simple shapes. (Mostly cylinders and spheres.) I would practice shading the simple shapes first. (You can do it with hard steps like cell shading and then reduce the steps until you have the 3 steps you have here. This will help you learn how to place the shades in the correct patterns going forward.