Here are new links to the ICO posters:
Also, I've obtained a great scan of the MI2 artwork from a German magazine which had it as its centerfold poster (big thanks to 90sGamer
!). I've started some slight cleanup and color correction, both with the original coloring and with my darker version (click for full size views):
Strangely it does look different from the box scan, which has some more highlights painted in and slightly different coloring (which I haven't tried to recover, so I don't know if it's "there" or not).
Edit: Updated with a few more clean-ups.