welp, let's go
I liked all of them, except for one but I'll get to there.
It's impressive of how quickly you figured out WHAT you have to figure out actually, most of new artists try to begin drawing objects and poses without actually understanding or studying them (mainly the objects and geometrical forms they're using). But you're visibly going to the right path by trying to understand each simple object you'll have to deal with in future works, and even you're doing an amazing work with that to be honest so keep it up.
Until recently I wasnt able to do these drawings and perspectives you just did with mastery and I still somewhat struggle with them in terms os execution, but keep focused in this "angles" thing and understanding each geometrical form in the third dimension, you have to be able to visualize ALL of these angles for each drawing you start. Like, from a small sketch you should be able to imagine the drawing in front of you from all these angles, you got me?
now for some details that bothered me a bit:
the lines werent following the 3D aspect of this sketch
I know this wasnt the focus of this training but I couldnt avoid noticing, try always follow the same pattern/parameter/measure for face's mapping
in the first frame the eyes were slightly touching the horizontal line, but in the second frame it was way below when you compare them