One of my new Tacoma students, Sophia, just got her first perfectly sized cello! You can tell in the pictures below that she's super pumped to have a cello that feels good to hold with her body (knees, belly, back, feet, etc.)
Something important for my beginning cello friends to remember is that they are holding the cello and telling it where to be, not the other way around. Below (left) is a good example of "Beanbag Posture," when the student slumps to accomodate the cello. Below (right) is a great example of supporting the cello with the relevant posture points. Check out the 90 degree angles going on in her knees! Way to go Sophia!