CG is so frigging complicated. Don't be discouraged, and don't give up on V4. I think V4 is a great figure. Yes there are issues. There are different issues with each figure. None are perfect, except, IMO, Apollo Maximus.

Here are three renders from my archives. 

#1 is my V3 two years ago. Terrible. I was just starting out and knew nothing.
#2 is my V3 a year ago. Much better, but needs a lot of work still.
#3 is my V4 a couple months ago.  (Full size here.)

Shaders, pose, lighting, textures, expression, render settings, all must be refined.

Search this forum for posts about realism and skin shaders (try "realism skin shader"). Particularly look for posts involving face_off. We've talked about it endlessly.

Also, have a look in the Node Cult forum at RDNA. Search for UBSS. I present a really basic 3-node skin shader there. Learn to use it until you've exhausted its possibilities, then move on.

If you really want to get advanced (hundreds of nodes in a shader), learn to use my matmatic program to make complicated shaders. Search here and the Node Cult for matmatic.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)