Bakeoff - no, not quite.
The DD didn't want to have her photo taken. Even if we assume that flower said "oh dd, stand here love, I'll take your picture!" and she ran off straight away, that does indicate she doesn't feel any protests or objections would be listened to - that she had to remove herself from the situation.
I think that is better handled by pointing out she's a role model for her younger sibling, reminding her it's dangerous, childish etc. I don't think time out helps there at all. If I had a contrite and apologetic child I'd say no more about it: if I had a bratty rude one I'd confiscate their phone and tell them off for rudeness to me.
The DS hiding the phone - I would, as someone said up thread, explain why that phone was important to me. I'd acknowledge silly pranks can seem funny; they can, when you're 33 8 but how unpleasant it can be on the receiving end of them. Again, if I had a shamefaced apology I probably wouldn't say any more - I'd certainly give a stern telling off to sulkiness or refusal to accept it was serious.
But, I think as I said above there's an underlying message with this behaviour and I'm saying that as the OP could be describing me at that age. My parents loved us but gosh it was 'my way or the high way.' They would micromanage our school holidays (both teachers) and lots of walks would be arranged. They meant well but my brother and I mostly remembered driving for somewhere for 2 hours in the car, feeling sick, walking, which we found dull as we did so much of it, and then another 2 hours back! But if we protested we would get similar lectures - should be grateful, Vicky/Jenny/Mandy aren't going anywhere, are they ... we'd desperately want to be Vicky or Jenny or Mandy chilling out at home!
In our teens, the relationship my brother and I had with our parents really deteriorated because of this and it never recovered itself.