Epic Mickey 2: The Power of Two

In order to restore the statue in the middle of OsTown you must complete the side quest called 'Goofy's Fountain Mishap'. When you resurface at the end of the quest and talk to Goofy he will ask if you want to use the head of Oswald or Mickey to complete the quest, you need to choose OSWALD. If you choose Mickey, then for some reason the store owner in the Gag Factory refuses to restore the Oswald head for some Scrap but will always make a Mickey head if it's done the other way around. There is no way around this so just make sure you do everything as stated. Once you have unlocked the trophy Heads Up using Oswald, come and pay the Gag Factory owner some Scrap Metal to restore Mickey to the fountain as well to complete the requirements and unlock the trophy.

To ensure you complete the side quest properly and ensure you don't lock yourself out of a trophy, see the Perfectionist Guide here: LINK for more info.