Not sure about the blood or teeth parts, but I kind of agree with adding better shading.

Sadly, the only helpful thing I got out of that is that I need better shading (which I've always known I had to add yet I still have no clue how to till this day) and that I need more pizzazz to my other body parts.
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Updated! Added a bit more of shading and lightening and finally made hands of my own.