Yeah drawing the head, or anything for that matter, from an extreme angle of up or down is quite daunting. It wears me out mentally quite fast. It all become easy for once I actually went through the intro chapters of H2D and ModernDayJames' gumroad video on dynamic drawing.
I used to hate perspective drawing, always thought it was too technical. I mustered up the courage to go through the first and second chapter of H2D and I have to admit, I'm loving it. But at the moment, I'm focused on anatomy but understanding the concept of perspective and being able to breakdown everything to simple 3D shapes really helped drawing these. I'll be uploading some work at the end of the week (I'm thinking this should be a weekly thing, to keep myself studying consistently. Thank you for taking the time to comment!