You have picked an excellent subject- you just need to exploit better. Get some different views. Try some up-close shots. Fill the frame with the bass. You'll get the hang of it.
I'm no expert by any stretch of the imagination, but I recall someone gave me great advice about taking a picture awhile back: take the shot that the person viewing the photo might otherwise never see. In other words, you have a great subject, but i'd love to see it from a completely different perspective than if I had simply walked into the room. I'm impressed by your lighting of the bass, very soft, very complimentary to the wood and the mood of the photos.



