An unfinished model of a skull. I made it as a base for sculpting. I added most features and proportioned it as correctly as I was able, with just some strokes in sculpt mode.
I don't claim anatomical accuracy. In fact, a good exercise would be to spot all the mistakes in the model.
The dagger that appears in the image is included in the file, but needs a decent texture (the one it has I hand-painted in texture paint mode, but apparently I cannot paint textures!).