Renee,
Jeff is absolutely right about drawing. However, nothing that you do is bad for you and you certainly want to have fun too. But if you want to get to the top in this field, draw until you are as good and accurate as a copy machine. It is extremely hard to draw as well as you will need to, but it is worth the effort and you can do it.
The best skull cast is made by
http://www.sculptshop.com/
It is cast from an actual skull and is actually more useful as a drawing tool than a real skull.
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