For decoration of the first notebook, I used thick cardboard with a thickness of 2 mm (binding).
Cut out a rectangular shape according to the size of the notebook.
Since notepads have different sizes, only the thickness of some of the strips that you can focus on will be shown.
I cut a rectangle of cardboard from the notebook to the curve of the cover so that it could be easily opened.
I drew the details of the future door on cardboard, cut them out and pasted them on the cover.
I painted over everything with acrylic paint.
The number on the door was created from two silicone molds.
Polymer clay baked for 10 minutes and glued together.
Taped it to the door.
I used a metal furniture handle to simulate a door handle.
On top of all covered with glossy acrylic varnish.
It is desirable to apply the varnish in 2-3 layers.
Creative inspiration to you!