Now I'm doing the texture-bake-thing just backwards, put the new texture onto the model, and setup the render to texture dialogue backwards, so use channel 01 with the texture which was drawn for channel 2 the picture on the right is the result.
Back in PS i just grab the new parts and move them to my old texture page.
And there are now a few new seams which where created with the texture bake, i marked them with red , but they can easily get erased, so you don't have to mind about them.
This is what you get.
3DTotal
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And there it is, the final result, without the seam between the hair and the facial part, hopefully this will help some of you, if this is too much work for you, just
take ZBrush, deeppaint3d or Bodypaint, but if you have the setup already made
once or twice it can be very effective