There’s no true one-click batch solution for this when the backgrounds are inconsistent. For images like these, you’ll usually need at least some manual masking.

The fastest practical options mentioned are:

• Use Photoshop’s Quick Selection tool to get most of the subject outline quickly, then refine the mask.
• Use a tablet/stylus to speed up tracing and cleanup.
• Consider a dedicated masking plugin such as Topaz Remask, which can be much faster than drawing every edge by hand.

Because the background is fairly different from the subjects, selection tools should still help, but expect manual correction around hair, edges, and clothing details.

If reshooting is possible, that’s the real long-term fix: photograph against a clean white background (or another controlled backdrop) with lighting that makes background removal minimal or unnecessary.

So: no reliable mass automatic cutout for all 266 images, but semi-automatic masking tools plus manual refinement is the realistic workflow.