You’ve made the classic beginner sculpting mistake of adding pores/wrinkles/etc before you have any of the primary form in place.
As it is there isn’t one area on the head that dosn’t look off.
You need to step way down in resolution and nail the proportions/forms/gestures at a very low polycount before going any further.(I can’t stress this enough as extremely vital to progression)
The anatomy of the head is very complex and requires a decent understanding of proportions/forms/gestures/planes if you intend to sculpt it.
As Leigh advised: study anatomy!! It is completely symbiotic with creature/character sculpting.
Learning the software/tools is the easy part. 