Vince3 - I had a go with around 20,000 hairs, just styling and not using dynamics. Not much to my surprise, when I tried to render (on middling quality settings) on P7, I got  "There has been a problem rendering..." message, swiftly followed by the total "vanishing from existence" crash that P7 is becoming famous for! I admit I haven't played with the hair room much, as I find even if it doesn't crash my poor computer it slows it down to such an extent that Poser becomes almost unusable if I have even an approximation of a realistic number of hairs. I suspect even if I could get it to work for a single portrait I would have ongoing problems, as I am going to want to use the character I am working on in multi-character scenes.

randym77 -  Yes, I've been looking at this hair. Have you got it? Are the textures any good, or are there any other textures available for it? I've been disappointed by some older Daz hair I've bought, but it looks as though this is the only hair with the appropriate morph.

Finally, I've posted a picture using my baldie character as he is working so far. The hair is Koz's allback with a lot of post work to tidy up the edges, but the final result is about what I had in mind.

www.renderosity.com/mod/gallery/index.php

Thanks to everyone for all the advice and help!

"Don't make me angry. You wouldn't like me when I'm angry!"