I have A LOT of experience with realistic textures and realistic CGI people up to Hollywood/cinema-level. I understand exactly what is needed and the idea is fascinating. Believe me, no one will be able to tell that the face are not of real people. I see what is needed with the skin texturing aspect, so what you really need is someone who can do CGI AND photoshop the appropriate mapping of textures. Again, I love this kind of thing. Check my page on freelancer. If you open up a chat I can send you examples perfectly suited to what you need. I really do think I am the person you want for this. We're a great match, seriously. Clients have included, among others, 20th century fox feature films division. Looking forward to getting started right away. David Freelancer portfolio https://www.freelancer.com/u/David100Percent but contact me so I can get you samples exactly in-line with what you need to the letter. I really have done this kind of thing before exactly as you examples show it, and I can prove that easily.