We've got artworks from Firefly Studios so I think they are ok :)

Actually this art is from the original Crusader - it was probably never use in marketing because it just looks silly.
In Extreme version of this pic you can also see burning arrows etc. in the background
EDIT
also check this:
http://www.mobygames.com/game/windows/firefly-studios-stronghold-crusader/cover-art

on official game site, on official wallpapers etc there is exactly the same artwork.
besides-
in developer I trust:)