My wife teaches grade school and even within the school they have very strict rules about photographing pupils without the written approval of the parents for good reason. However, in the big picture, the world's a screwy place to be sure.
So we abide, give you the brush and paint you red like the back up lights on a work truck. Just doing your business. Fair warning. Artist at large. On the up side it could probably get you some work around the Christmas Season as well with that fine white beard of yours.
So all that said, now talking about the adults you have been depicting, they're great. I am sort of jealous that Kenmo beat me to the joke as I was going to ask which bus line you travel. I'll have to take it if I ever visit the UK.
I think you have a good knack for the human figure especially in the context of a concentrated focus like a drawing class. The forms work well, and the outer shapes are intriguing. It all implies pretty fair proportionate volume without interior lay-in marks. I think it shot you into a higher place with your observation. Just keep drawing nekkid people and we'll merit you into the After Nine forum yet! Something to shoot for.
That Tolouse pose -- WOO HOOO!!!!!!!!!!! Great! You might have done the original it looks so right. And your collection of portraits, looks awesome. Lots of great character and your voice seems to be slipping into them in a harmonious way. A bit like singing some common songs down the pub with some folk that wandered in. . . that is to say metaphorically speaking. I can look at these pics and 'hear' the different voices in harmony with you 'voice' - sympathetic, not at odds, these, yet full of character. As to the real world, that takes some ability to read a scene and know how open it is to active participation with the real people you're depicting. It can be nice when it works. I expect in short order you can be giving us lessons in that.
So well done you! Keep going. It's showing a lot of progress in skill and regression in age, my friend.
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream