I don't agree (respectfully).
The girl resting her cheek on the instrument signifies a passion and an emotive link to the cello. It appears that she see's it more as a friend than an inanimate object, something she is involved with...a bond. This is the mark of a true musician. It shows they are part of the same and its not just a prop. She seems so relaxed and informal in the image, its wonderful.
I would not change a thing.