Head study need some guide

AliArto

hi  guys this my latest head study what do u think of if ?
i really focused on the forms and the skull inside this my result 
yes i know some of the features i don't like it yes ears and nose lips and the chin 
the chin everytime i think about it's my mind gets blur need to focus on that
and may i ask question how to study plane of the head and high points i got this advise previous post i search i didn't find any specific result  
btw i did use  walter white refe i did try capture the likeness i know it's to soon for likeness right now but i want to try it since my goal create normal anatomical head and thin do likeness study 
thanks 

carvuliero

Hard work is starting to pay off , much better attempt then previous Below is example of high points and planes

AliArto

thanks a lot @carvuliero

AliArto

i did create this plane over my last study still need more works