Just another Hello every1 and need advice

Loving this Site more and more. Perfect recipe for everyone here. First of all... Hello everyone... My name is Kartik. Im From India. Im just another hobby artist and i am in need of an advice.
I currently am working on portraits with charcoal for the past 2 months and still cant get the facial proportions right. Either the face is too tall or short or something. Can anyone please share some tips. I work for approx. 1 hour per day everyday. Would really appreciate some insights. Thank you😊

I found this to be useful. Hope it helps.