Faces are a nightmare. Other artists in my animation program struggled mightily with hands and feet primarily (I notice you dodged the feet, so maybe that's a thing for you too?), but for me faces were the worst. My life-drawing portfolio is full of faceless models lol. Somewhere around then, I realized I don't really remember people's faces. Like I recognize people by their faces, but if I had to relate their description to, say, a police portrait artist, I'd have a bitch of a time. I have no idea what that is.
Also, if you haven't already, I 1000% recommend enrolling in a life-drawing class. You'll get lots of helpful feedback, a ton of exercise for your fine motor muscles, and drawing a three dimensional human is completely different from drawing from reference photos. Also, a good life-drawing program will force you to draw a wider range of body types, which can be surprisingly helpful!
Keep up the great work!