Well, you’re half way there halfgaar. This is a good start for LSCM, next you need to pin a few vertices and then do the LSCM again, repeat pinning vertices and doing LSCM until you’re satisfied.
Here’s what I’ve done that has worked for me. I’ll start like you, put a seam or two in and then select the vertices I’m interested in and do the LSCM unwrap. The I grab a few of the outside vertices, probably the ones in the 4 corners along the seam going down the back of the head. I’ll move these to the proper place on the image/texture and then pin (PKEY in UV/Image Editor window) them.
Yeah, this messes up the texture mapping, but if you do the LSCM unwrap again, it uses those pinned vertices as input and this initial pinning of the four corners will fix the orientation and the next LSCM unwrap will be much closer to what you want.
If you’re making a new texture, you should only have to pin a few vertices to set the orientation and relative positions. If you’re trying to match an existing texture, you’ll probably need to pin most of the vertices along the seam and a few critical vertices for important features.