Puppets and piano practice 9

It's a challenge getting J to keep his eyes on the music while he's practicing. When I nag him about it, he gets upset. Today I found a partial solution, which I should have thought of earlier: delegate the job to Thusnelda:

I told her to watch J like a hawk and make sure the eyes don't stray down to the keys, and that she's to give him a nasty look if they do. Thusnelda gives a good nasty look. Check this out. Normal:  

NASTY: 

It worked very well. Unfortunately it's only a partial solution, because of course I have to be right there.