Your English is fine.
You are trying to make something that takes a professional weeks if not months to do in minutes.
As I mentioned before, learn the steps to do it by hand. Then taking whatever is produced by whatever else and adapting it is much faster.
General pitfalls and reasons things look bad are material related.
Most auto characters have 1 material slot.
Got get a decent face to render you need at least 5 materials.
Skin, eye occlusion, eye, eyelash, eye tear line.
Then if you add hair you have hair, beard, eyebrow, and probably peach fuzz.
On top of all of that you probably have the skin/clothing which can be another whole set of materials…
So you see, if you have never gone through a proper setup and created/modified the materials at least once, you are obviously left wondering why things don’t look right without any idea of where to start…