First of all welcome to SFWC Morpheus.

All that you said in your post has to be taken very seriously when drawing simpsons characters and Homer in particular imho.
The only things I just dont agree with are the shoulders, imo too low, and the mouth issue. I don't know about others, but to me that mouth is just too big and tall, making his whole head look taller than usual. This is one of the things that imho has been worsened with simpsons "looks", going on with the seasons. Especially noticeable on this particularity of Homer's head, or Lisa's overbite... but it's just personal tastes in the end... i think the Simpsons of the earlier seasons looked "cuter" (yes, even homer) and more cartoony. But this is just a rant that has not much to do with your tutorial.

* SimpReal feels bad for not having done anything else after the Lisa head tutorial.