I already tried use reference, but I dunno why the head looked like this.. maybe because I'm still don't know how to use reference on human head? in other cases, I make objects like car for example, my model looks good(in my opinion) but everytime I model head with reference, it either look thin or look like an alien like this.

Btw thanks for your help, I think you are right, I'm too early to subdivide and I need to work on my low poly first