I like the second image. Is that a singing practice or is it a lecture room ? I like the perpective of the image, you can see what each of the plants are doing. If it was a lecture then maybe some could be sleeping at the back ?
It is supposed to be a singing practice but some could sleep in the background: it could be fun. Don't hesitate to re-draw the sketch to include your own ideas. It is a work in progress!
I like the second last one, the idea that the plants are more in the foreground and not paying attention is sweet.