There isn’t a simple one-click tool mentioned here that will perfectly standardize face size and placement across mixed portraits, but you can automate parts of the job.

A practical approach is:

• Use face detection to locate the face, then script the crop. One answer suggests the command-line tool “facedetect,” which returns face coordinates you can use in a custom script to crop images to your desired framing.
• Use batch editors for resizing and repeated adjustments. IrfanView supports batch processing and can handle resize tasks efficiently.
• Use a RAW editor for semi-automated workflows. In Adobe Camera Raw, you can crop and resize one image, then synchronize those settings to similar images, while still checking each crop manually. Darktable was also suggested for resizing and cropping, though the crop itself is not fully automatic.

So the realistic answer is: batch resizing is easy, but precise face-based cropping usually needs either manual review or a custom face-detection script. For best consistency, combine automatic face detection with manual spot-checking.