Find the 20 Frogs in the Belltowers

To celebrate the 20th anniversary of Harry Potter I made my intepretation of the Bell Towers. First of all I tried to recreate a few scenes, like the one where Harry Potter need to go to Professor Umbridge's offices or the scene where Argus Filch go through the library to find Harry under the Invisibility cloak.

You probably already saw the 20 on the triwizard cup but I also hid 20 frogs on the model. Can you find them all?

Hope you like it. Good look to everyone.