For a forthcoming bit of magazine tomfoolery, I've finally painted up one of the 7mm scale 3D prints of me bought from Modelu.
Now in paint, it's incredibly effective - it really does look like me, recognisably so.
This is interesting because the Modelu prints aren't the most detailed figures available in this scale. Whitemetal models from S&D Models have far more surface detail, especially around the face. I'm not sure they are as lifelike as this though.
Which all goes to prove something I remember reading some time ago. With figures, the overall proportions and stance is much more important than detail. A mis-shapen figure covered in detail still won't look as "right" as the simpler figure properly proportioned.
It's all down to how we view out layouts. Most of the time, we see them as though a few fields away. That means that despite the worlds obsession with fiddly bits, you some see them on a model any more than you see them from a distance in real life. OK, when a camera is pointed at the models, maybe you see the finer points, but I suspect most of the time, if it looks right, then we ignore it and are just happy.
Expert tip: If you are being scanned for printing, and wish to paint yourself to match your clothes - don't wear a stupidly checked shirt!