I'm having trouble with the lighting in a drawing.  Attached is a picture of the drawing.  The lighting in the top right drawing is acceptable (some glare and dark spots though).  The bottom right drawing is pretty bad though.  It's pretty dark, and printing even darker.  I've tried adjusting the directional lights but it won't let me move them for some reason and I'm not sure what else to do.  I don't know if it would just be best to turn off the lights? I'm not sure how to do that though.  I'd appreciate the help.