face symetry action

If you want to select half of the document, duplicate on new layer then flip that half, that can be easily done using action. Change Window > Ruler to percent then start doing things using Marguee to select half of the image....

In case that you want to automatically detect nose and select left portion of image starting at the middle of nose... that will be difficult task.

Hi, you have to record action yourself anything can be possible just record what you want to do and check on any other pictures hope it will be good...regards

read this article hope it help you.

https://www.adobe.com/products/photoshop/actions.html#:~:text=Adobe%20Photoshop%20actions%20are%20a,they%20help%20you%20automate%20tasks.