Well then forget about it because I can't honestly do a lot better... I'm no 3D artist and I'm merely trying to use in a smart way resources made by users of an opensource character generation software,
Makehuman...
When you say the lines are too sharp and so on, yes, of course I agree, but what you are asking for has a name :
photorealism. You can get this with softwares such as
Poser or
DAZ Studio, but you're going to pay 20$ for each single hairset... If anyone has that kind of money, please go for it
At this point the best I can do is to give the link to the tools, hoping that someone will do better, which will involve creating hairsets, beards, normal maps and all that good texturing fun in Blender... I don't know how to do that and I'm not a professional, so I can't spend 12 hours a day on it. So here it is :
Makehuman : http://www.makehumancommunity.org/
Blender, of course :
https://www.blender.org/
You'll need some plugins to make the two work together, what you want to do is to import/export files in .mhx2, a format designed especially for
Makehuman &
Blender interactions. Blender itself is an extremely powerful and opensource 3D software, but the interface is punishing. You're warned !
Why can't we find professional quality resources in open source ? The answer is quite simple : people that are that good ARE professionals, and live from their artwork. Hence the
other way, gilded way of doing things.
For people that have a magic
+4 everfull gold bag, here is the best of the best :
Poser 11 : https://www.posersoftware.com/
Daz Studio :
https://www.daz3d.com/
Notice : the
Daz Studio editor is free, but you won't make 10 different faces with the "free" resources, you'll have to buy stuff. Which can work, really. The point of those softwares is that they give you "ready to use" 3D solutions, allowing you to focus on the actual rendering work. The gurus and professionals using those ones can make pictures as real as photographs, no one can tell, which is extremely useful in advertisement (might still be cheaper than hiring a real model and photography hardware). I think its waaay overkill for our purpose.
I'm not saying I don't want to continue either. But I have to take in consideration that I spend 1 to 2 hours by portrait, and should keep a pace of 2 or 3 a day to go somewhere. Its a lot of work, and it has to be useful. If someone can do ol'good hand drawing, the result will be better.