The first proper GW mini I ever painted (as far as I can remember) was this Space Ork. It was 1994 or thereabouts and I was 12:
As you can see, it's all flat colours. My only attempt at 'shading' was leaving the black undercoat visible in some of the recesses. I seem to have given him some battle damage on his armour plates by scratching through the paint to the metal underneath (most GW miniatures were still made of metal back then - and still had lead in the alloy). And I apparently believed that blood looked like red paint splodged on haphazardly.
I am actually somewhat impressed that my 12-year-old self took the time to paint his eyes, teeth and nose ring. Not very neatly, but at least I tried. Shame I must have lost interest before starting on the base.
He had a paper back-banner once that I photocopied from an old WD my brother lent me and then coloured in with felt-tip pens. But it must have fallen off at some point, because there's no trace of it now.
For comparison, the most recent minis I have painted are still my DE Shades from back in August: