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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 Homo erectus crania:
https://3d.si.edu/object/3d/homo-erectus-cranium:0b1d7e98-3dd0-4614-93d7-a2ae3cc9b11c
https://3d.si.edu/object/3d/homo-erectus-cranium:fa3987fd-639c-4aee-9361-fb25dffa3407
https://3d.si.edu/object/3d/homo-erectus-cranium:8b87e356-a0fe-44ee-9800-9e0ea91c358c
https://3d.si.edu/object/3d/homo-erectus-cranium:4556aebf-c1e3-4f41-b9af-fcacbfb590c9
https://3d.si.edu/object/3d/homo-erectus-cranium:ee27f011-ec1b-4ec8-9ad7-b2310ae273f7
https://3d.si.edu/object/3d/homo-erectus-cranium:389c2454-67cc-4b77-b5c5-9d10fa013206
https://3d.si.edu/object/3d/homo-erectus-cranium:2cf9717a-5b5e-43e5-882c-0d499ea21ed0
https://3d.si.edu/object/3d/homo-erectus-cranium:54a59bc3-0617-436f-8e1b-c085374cd2d9
https://3d.si.edu/object/3d/homo-erectus-cranium:9aec7429-5dce-42eb-aa5a-0cb94863b94c
https://3d.si.edu/object/3d/homo-erectus-cranium:b66b053d-a46d-4bb7-9ec4-32b676c31f8b
https://3d.si.edu/object/3d/homo-erectus-cranium:db88ad7e-2060-4a6e-88b5-92c706ea17a1
https://3d.si.edu/object/3d/homo-erectus-cranium:79b2e06f-c4a2-4d11-a066-bc4d71107192
https://3d.si.edu/object/3d/homo-erectus-cranium:b2c8c6ff-069d-42da-98ae-9bf12fce60f2
https://3d.si.edu/object/3d/homo-erectus-cranium:5eb91ba1-ca8a-4f46-ae3a-f18024487696
https://3d.si.edu/object/3d/homo-erectus-cranium:14eca898-fe6e-40a9-a21a-d4bdd6eede7f
To view all of the models follow this link: https://3d.si.edu/collections/hominin-fossils