I strongly recommend starting with low polycount characters.

so I would sculpt what details ya want on the 400,000 mesh ya posted.

I would keep her mouth shut n forget mouth n teeth and just have textured eyes modeled in to her face forget eye lashes.
then retopology a low polycount mesh & use normal for details. 

A low polycount character is a lot easier to learn with. 

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance