Hi Leif,
I'm really astonished how well the figures turned out even at a about three times the size they were intended to be! You've done a tremendous job on them! Of course, I can't speak for David, but as far as I'm concerned I have no objections against re-re-publishing the modeified files.
One way to get to new figures is to use a graphic program and make a figure kit from any suitable foto, scan, or drawing. I've attached two pictures as an example. The first one is a scan from the Preiser catalogue, which shows a set of H0 scale sailors, and the second are the figures I made from the scan (but in 1:250 scale of course). The mentioned Preiser catalogue can be a great source for figures, but there's a lot more, like Moduni's whole figure section. Just have a look at these two figures.
I always thought that the prepainted H0 figures (and larger scales are even worse) look too flat. With cast figures this can be overcome by painting techniques like dry brushing and washings (if your interested, have a look at Brian Fayle's figure painting site). Same applies to the paper figures, too (of course not the painting techniques). In your size I'd start with darker areas around the eyes and the mouth. The catalogue scan gives quite a good impression of what I mean.
To the end, allow me a little personal remark: In my eyes it's quite amazing what has become of a little fancy idea that I once had during my lunch break at work. Started with David's reworked files, Sepp's numerous creations, your upscaled people, not to forget ***** laser cut animals... And it's not as if the idea of using several layers of card board to give a something more body was new or revolutionary!
Keep up the good work!
Michi