Very few Miss! Miss! things - most seem to stand there silently, waiting to be spoken to. I suspect they've been taught 'disturbing' somebody who is on a computer is a very bad thing.
Most look thinner and pale/cooler toned (of all ethnicities). Some look very, very thin (reports completed, obviously). Quite a few injuries as a result of very simple, normal movements. Back ache and shoulder pains. Very closed body language. Fewer 'please take off the makeup/nail varnish because it's against school rules' occurrences. But if they are doing something they shouldn't the vast majority are far more responsive to being asked to stop, rather than arguing about it.
There doesn't seem to be as many harmless, silly things happening (giggling in groups, running for the fun of it, cartoons on the whiteboards).
They seem to have lost all the ebullience they used to have, but even something as daft as the way I wave my hands around when I'm speaking or how my eyebrows waggle about (after all, they can't see if I'm smiling, I need to give them some clue) make them smile. I am having to get closer to a lot to be able to hear them, including bending down when they're only a few inches shorter than me and I am extra careful with my tone of voice, as I'm mindful that simply raising the volume to get through the mask upsets them.
Thinking about it as well, I'm used to coming back after half term to find that the Year 9s have shot up taller than me seemingly overnight. I haven't noticed that with the Year 9s this year.
They seem to be getting up earlier and sleeping worse - we get some that just look so tired now.
They will get some of it back, I'm sure, with PE and daylight and food, but to be honest, I think what many of them really need is somebody they love to give them a big hug.