Raccoon photo: public-domain source identified in SciPy face documentation. Source: https://github.com/scipy/dataset-face and https://docs.scipy.org/doc/scipy-1.11.4/reference/generated/scipy.misc.face.html . PNG is a pixel-preserving decode of that RGB dataset. Cutout and JPEG copies are unretouched KitForma tool outputs.
Synthetic alpha-source.png artwork: created by KitForma, CC0 1.0 https://creativecommons.org/publicdomain/zero/1.0/ . alpha-white.jpg is the actual KitForma JPEG conversion.