Nice manips! I have one comment though; this is for the third one. I like where you're going with it but casing/floating plates doesn't look like it has the correct depth or perspective. It looks like that the plates would form into a thin case, but with a tree with that I'd imagine that it would be smushed together if you were to put the pieces together.

Perhaps you should space it so that the pieces look like they surround the tree in a more dome-like structure. And maybe make the bottom pieces look like it dug through the ground a little because it looks weird if they are just standing like that.

Sorry if I don't make sense. I love your work. Keep it up.