Hopefully worked out OK but you need shadows to reveal the structures and features of the bone so diffuse light is out.
Key to avoiding shadows is either a lighbox under the bone and balance your flash or easier black velvet which can get from most indoor markets in UK.
The light (i.e. your flash) must be directed from superior to inferior in direction otherwise bone just looks odd. You can use something as simple as a piece of card to reduce the shadows. Ideally use a copy stand or failing that a tripod and a cable release.
Great thing about bones is they don’t move so long exposures are OK if not using flash providing you can keep everything still. For detail you need close-up facility and can always tether camera to a laptop to use techniques like focus stacking and HDR.
Some pathological features are only visible with cross-lighting (e.g. aspects of symphysis pubis and Schmorl’s nodes on vertebrae). Again, a good reason to avoid diffuse light!
For more info welcome to e-mail me at firstname.lastname@example.org as I am developing a guide to Osteological photography as so many photographs that are being published are not very good (putting it politely).