Switch artwork with Auto-swap

Create a group with independent content inside.

In your original PSD or AI file, create a group including your artwork in multiple positions. For example, a Left Arm group filled with ten different possible arm and hand positions. 

Make sure the contents are all independent by adding a + in front of each layer name.

Add the Leader/Follower behavior to your top-level character. 

Add the Leader/Follower behavior to the root of your character, alongside your normal behaviors like Face and Eye Gaze.

Create and tag your leader layer. 

Find the layer you want to start with and add a new blank handle onto where you want to drag it from. Press Enter to bring up a name dialog and type in a unique name for your handle for example Guide. Then, with this handle selected, tag it as Draggable and Leader.

Create and tag your follower layers. 

On every other layer, create a blank handle, name it the same as the leader (guide as mentioned above), and tag it as Follower. Repeat this process until every layer in your group has either a Leader- or Follower- tagged handle

Create an Auto-swap set. 

Drag your group into the Triggers panel over the Create swap set drop zone. Select the newly created swap set title and check the Auto-swap checkbox below to change this into an automatically triggered swap set.

Test out your scene. 

Now if you try out a scene and drag over your artwork, you should see your artwork automatically change as it moves from position to position.