The standard is to put UV seams for skin where they will be probably covered, ie: clothes or hair. The main issue is when you will have a skinhead character or a almost naked character. Anyway, with the FBX in hands, anyone can customize the UVs to better define the use for the character, but a UV mapping can’t solve everything. There are techniques to make the seam almost invisible, but I don’t have experience enough in this to be able to describe in a language which is not my mother language >.<