Could someone help me find out which techniques were used and can you do this for a still photo? Thanks!
Hi
You could try something like this.
Start with two images one with the person facing straight on the second with them sideways. On the second remove the background.
Use the clone tool without align checked to copy the second image multiple times across the canvas onm a separate layer.
Use motion blur on the cloned copy layer to blend it
Use Transform> Warp to bend the blurred copies
Add a mask to the side view and cloned copy layers, and paint on the masks with black/white using a soft brush to blend them

I hope that gets you started
Dave