I frequently do mini bow hold makeovers with students. Sometimes the tiniest alterations make the biggest difference! In this case, we changed how the bow is involved with the cello and body.
In the top photo, you might be able to notice that the bow was being used like a sword is used. This student was one knuckle away from using their bow like a baseball bat. Oh no!
In the bottom photo, after the makeover, you might be able to see that this student's relationship with his bow and cello has now changed.
There is no longer a posture of ordering his cello to "stomp out" a sound. The change has now prompted him to *ask* his cello to release sounds.