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The original version of Fighting Fantasy universe's analogue to the Monstrous Manual, Out of the Pit, had some page-sized full-colour illustrations included, which were excluded in the later 'pocket-sized' edition.
Simon Osborne has kindly scanned in these for those (like myself) who got the cheaper version.
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Doragar (Christos Achilleos)
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Night Demon (Julek Heller)
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Brain Slayer (Terry Oakes)
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Fog Devil (Alan Craddock)
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Life-Stealer (Ian Miller)
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Dracon (Julek Heller)
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Dark Elf (Mark Bromley)
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Shape Changer (Iain McCaig)
This is "a mirror reversal of the cover of The Forest of Doom"