Like I said, this exercise is quite difficult, but when you’ve (finally) ‘mastered’ it, it’s very rewarding!
You might also want to look at @yukinoh1989 ‘s post here: https://blog.cgcookie.com/forums/topic/when-i-add-the-bevel-modifier-nothing-happens/
You are making more of a stylized head, but there are many simularities and there is not just 1 way of doing this, there is a lot of freedom in topology, even within some basic rules.
Just keep (re-)doing it and you will get better! (And, frustrating as it can be sometimes in the beginning, it wil also get more and more fun!)
