Create a Dynamic Shadow

Add your Image

Set its Opacity to Zero

It can now be used a FRAME for adding other Instances of the same Image

Add two more instances of the same Image to the FRAME IMAGE

The three instances of the Image can be renamed:

Add a (Toning: Grayscale) COLOURISATION Step to the SHADOW Image and adjust its OPACITY and BLUR to taste

The Initial Position of the SHADOW can be adjusted in the PAN Settings

Add a Key Frame to the FRAME and SHADOW Instances of the Image

Animate the Image by means of the FRAME

Adjust the FINAL Position of the SHADOW by the PAN controls