How do I complete the incomplete symbol on the door in Faron Woods?

Solution 1:

To draw on it, you need to Fi to acknowledge that you have found the symbol template. Then go to the incomplete symbol and hold your sword up and do not do a strike! Instead you must let it charge, and go up to the symbol, then after a second or two you can draw to finish the symbol. It is similar to the process that you use for the Goddess Walls.