Hi Sophia, thanks for your question. The rocks with faces will only move when you collect the pages that they require from the other creatures that you find. If they aren't letting you pass just yet, it means you still need a page from somewhere in the surrounding areas.
It sounds like you already did the quest that gives you one of the items you need to enter the mansion. You'll want to get another Blueberry Pudding page if you haven't already, and you do that the same way you got it the first time. You'll also need the other page you can find in the hedge maze area. Now that you have the curiosity from the quest, it will be possible to get the second one you need to pass the rock.
Let me know if you need further details but hopefully that helps get you back into enjoying the game.