ok, so i can say all i want? as long as its constructive of course....
I just went through the bestiary, ok, first things first, the wolf spider?! thats is one weird looking combo, i mean, yeah, sure, in theory it sounds all vicious and stuff, but, imagine this thing, i for one would be more inclined to laug at it that be scared, i mean, spider body..andthen... a wolfs head!! you have the neck and head of a fast, agile, active creature, with the body of a slow, patient, clever creature, i dont know, the combination just looks too damn unlikely to me, if youd at least stayed in the same category of creatures, but, Arthropods and Mammals dont mix too well...
and about the Eyewing, spy eye, whatever its called, nothing like it in dnd, but if youd like a reference, there is a similar creature in Magic:The Gathering, as a card, its called Belbe's Percher, the flavor text at the bottom gives a brief desc of the creature, and for a more detailed look, youd have to read the Magic novel Nemesis by Paul B. Thompson, basically its a birdlike thing, kinda leathery looking, it can rememeber short frases and copy them, used for comunication, oh, and now that i thin kabout it, theres something else too in magic, in the Moons Of Mirrodin novel, its liek an Orb with a birdlike body, has wings, and a fin, used basically as a spycam, and has an electrical ray weapon of sorts.