I saw some freaky Sigilyph redesigns on tumblr and decided to take a shot at it myself! I think a lot of people kind of underestimate just how downright terrifying this thing is, especially if you imagine it in real life. It's probably the most bizarre, unearthly looking creature in the whole Pokemon franchise at any rate.
I mean, you're just poking around in some ancient ruins somewhere and suddenly... THAT... comes flapping around the corner and squawking at you...
I saw some other fanarts interpreting the zig zags on its stomach as a set of teeth, so I decided to go with that!
Also, I like to think that its two "faces" actually think independently of each other (the bottom one controls the legs and the top one controls the wings, so I imagine it spends most of its time just sort of... flailing around whenever it gets upset/scared. Which is pretty damn creepy when you think about it.)
Also also, I imagine it doesn't have another eye on the other side of its bird head. It's like a flounder!