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Not sure if rotational values are represented with Orient to Camera, but try this.
Make sure 3d is enabled for everything you create.. Create Null ("Null_Circle") in center of circle. Parent Circle to Null_Circle. Place object offset from the center. Create another null ("Null_Object") at the same position. Select Bull_Object and parent to Null_Circle, and change it's Layer/Transform/ Auto Orient_Camera. Precomp Object and parent to Null_Object.
To change the objects based on a rotation you can use and if/else/else expression on Time Remap; place the contents on frames 1,2,3, and make sure your expression /24 (or whatever your framerate is).
Another way I've swapped out pictures is if/else expressions on Opacity (ie 100; 0) parameters of layers.
Place the first picture where you want it to be on the turntable. Now add the other two pictures at exactly the same position so that all three are on top of each other.
Now parent picture 1 to the turntable and rotate the turntable 60º. Then parent Picture 2 to the turntable and rotate another 60º. Now parent Picture 3 to the turntable. All three pictures are not children of the turntable and are distributed evenly around the turntable. Now parent the turntable to the null and use that to rotate the entire assembly.
Yes, this worked. thank you.