Straighten and Tilted faces.

This is the very basic preset, photo with 3x4 proportions with big face in the center.

As far as we know location of the point between eyes and bottom point of the jawline we can straighten the face by aligning these points vertically. Icon for straighten presets has white vertical line.

Straighten function usually works well for all photos as far as a person on the photo looking directly on camera.

Beside there is an option to set additional tilt. Here is a photo strighten and tilted to 23 degrees.

Note that center of the image rotations is the point between person eyes, and person face is always remains in selected position inside the crop bounds.