It's me again...I am in the last tomb room. I don't die..but the door doesn't open.
I put the mask, pus down the gold mask and take the cogwheel, I also try without the mask.
I push the plates in order but...the door stay close..

It's o.k. I stop and replay the game with my save . I do the same thing and it's O.K.

I hope this means that you got out of the last tomb room.

That puzzle is picky - to redo the puzzle - you always have to start on a saved game because it doesn't reset and when you have pressed the pictures correctly move to the back of the tomb, wait a few moments and then the secret door will open.

Yes I am out of that tomb, now I am trying to open the door in the statue room. I am always too slow and the door is close...

This is what I did on this part -
While the view is of the kettle going down, there's a wood structure that goes left and right at the middle of the screen - I think it is part of a possible chain that pulls the pulley down due to the weight of the kettle and the other end of this is the one that blocks you from going to the double doors after the swinging door is opened.
I look at that first small rectangular thingie to go to the right in complete view and then I pull that dangling earring and run to the double doors.

I do have a saved game here.
Hope this might help.