I have a bunch of these I have tossed and I am not even showing here as I know they did not work out the way I wanted them to. But these two are getting there.
In this first one - I think it may still look a bit like a view point of someone looking out over the class, as opposed to that of someone seated in their desk. I think that may have to do with the fact that I reveal too much of the tops of the desks - they need to skewed down to show a more narrow slice and then it may not feel like we are so much over them.
What I like in this one is that Niko is clearly larger than his class mates. And with a kid behind him I can have that kid leaning to show he is struggling to see around NIko to add to his awkwardness in this gnome world. But I find in all of the thumbnails either he or Kate will end up in the center of the image. Not sure yet how to avoid that as I dont want to put either of them to much to the left as this is a page that will be on the right side of the book so I want the critical visual info to stay away from the left edge and gutter.
The other thing is that this page layout is not leaving much room for text. So that needs to be considered as well.

In this next variation I feel like we are definitely viewing this like a kid seated behind NIko. (As opposed to a view from the back looking out over the room).
I like how much blank board space this provides for the text on the page but also for Kate's contraption (could either be a real model or her designs drawn on the board - I like having those options).
We get a real feel for Niko being larger than his classmates. But again he ends up in the center - so from a composition stand point that might not be good, not sure since Kate is actually the one with an action in this scene.
