For external sources you need to link to the info page NOT the actual image page, as we have no way of telling whether it's usable. It's down to you to prove the validity of your sources. I'm going to guess it's not usable. It looks illustrated. (which is against the rules unless you've illustrated it, in which case you'd need to provide some sbs's of the process)

cgtextures.com have a range of x-ray's that could probably replace your skull.

As for your entry itself, my initial advice would be to inset your metal parts more, at the moment they look pasted on and not a part of the woman...

GL