The newness of the clothes is indeed something to look at next. I usually add a world color variation for stains and dirt over almost everything, but in fact I should make wear and dirt on UV basis, which is more work again
I tend to stretch the UV's based on the kind of texture I want, but in fact I should do it the other way round, keep UV within borders and stretch textures in TG. Easier to add some torn edges too.
But a partial, procedural bleaching and dirtying up might do simple wonders for the time being.
No, I use DAZ to pose the basic Genesis 1 figure, but I've made facial morphs, and found a bunch on the internet, which can be combined in quite a few face shapes. All sorts of body shape morphs are integrated in DAZ. I don't yet subdivide and sculpt/finetune every character in ZBrush, which would of course be a logical step, but takes even more time.