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Among the many terrific resources made available online by the Smithsonian Institution is a page with 3-D images of fossil hominin cranial casts that you can manipulate to view from every conceivable angle and perspective.
Follow these links to explore 3-D models of a Homo habilis cranium:
https://3d.si.edu/object/3d/homo-habilis-cranium:de47a0c6-20c6-4d70-bcc8-4992d5f4ff66
https://3d.si.edu/object/3d/homo-habilis-cranium:4c474d9f-72b2-49ab-bdd2-9f4b9d250cd2
Follow this link to explore a 3-D model of a Homo rudolphensis cranium:
https://3d.si.edu/object/3d/homo-rudolfensis-cranium:6d2ecbf8-0d42-4277-a475-4a3d9208ecd3
To view all of the models follow this link: https://3d.si.edu/collections/hominin-fossils