The statues can be moved in any order, as long as the pairs are correct. They are ordered here for ease and clarity when searching for the statues.

The statues are scattered throughout the exterior of the Lighthouse and can be found as soon as you first exit the building. The easiest pair to deal with is above the door to the Lighthouse interior. There are stairs on either side of the entrance that you can take up to the second level.

Directly above the entrance you'll find an open overlook with a statue of Mythal and Solas. Turn both the statues so they face each other. Rook will make note that there are two more sets to find to solve the riddle.

The next statue to find is near the first building on the left side. A Mythal statue is on the left side of the building. There's a small path at the base that leads you around the back where the statue is. Turn the statue to the right to face the Solas statue to the north.

Head to the second building on the left side to move the statue of Solas. You have to climb or jump down the ledge to reach the bottom of the building. The statue is found in the opening near a regular chest. Rotate it to the left to line it up with the Mythal statue you just moved.