Those optical illusions are awesome. The one with the spinning silhouette doesn't work with me. I always see her going clockwise. How do you get her to turn the other way?
When I'm watching her spin, I look at the leg that's raised in the air and tell myself that it's going "behind the other leg, in front of the other leg, behind, in front, behind, in front... (and so on)" - then when I want to change her direction, I start saying it to opposite way to myself ("in front, behind, in front, behind..."). There are other ways to do it of course, but I thought that was easiest for me.