More than one (very attractive) solution.

Many possible solutions :(

Yes, very difficult!!
A little help: there ist a square in a square in a square in a square in a square with 4 rectangles an 8 very little squares around.

I'd say it is more like:

A square, in a diamond, in another square, in another diamond, in the border square with rectangles and diamonds surrounding.

Thank you, strikerts! That was the hint I needed.

Terrible.

Thank yuo.