I'm happy you're enjoying the game anyway.
SPOILERS:
About the hint, after some research on Google I decided to change its words a bit with the next upload.
Since English isn't my first language I didn't know which words would fit better for it, so I think that "bespectacled" instead of "four-eyed" would be a better choice of words for what I had in mind.
(If you know Italian, the original word is "occhialuto")
So the riddle becomes "The key to the studio lies under the bespectacled poppy."
I hope you find out what it means ^^, it can be tricky, but not necessarily.
Oh, and about the stone, I'll tell you this: not every in-game object that can be taken will have to be used somewhere; the fact the player can take nearly every object that appear in the descriptions is for "realism", but some are useful, some not. I'm telling you this cause I don't want you to waste your time, for example, trying to use the stone on every single object ^^.
I hope you won't find any more problems ahahah ^^
But if you do, do not hesitate to comment here as you've done so far :3