To find the raven, look at one of the curved rib at the right side. Raven #4: Drop into the area that has stone pillars just like ribs. Go further and then towards the left side there will be a long opening from where you can see the sky. Raven #3: Once you have solved the sand bowl puzzle, enter the cavern.
It will be perched on a rock, and you will find that rock before you cross Wildwoods’ Edge bridge. Raven #2: Towards the left side, just past first Mystic Gateway in the area.