Paul Kidby is an English artist. Many people know him best for his art based on Terry Pratchett's Discworld. He has been included on the sleeve covers since Pratchett's original illustrator, Josh Kirby, died in 2001.
in case you mean the "thing" in the lower left corner of the second pic, that's Errol, Lady Sybil's pet swamp dragon. What looks like facetted eyes & an insect "trunk" in the slightly blurry pic is actually a snout with giant nostrils.