This one, to me, could be mistaken for not only an actual photo of a dog, but my own dog. (aside from the cyborg implant, which is a bit of a giveaway :) )

https://www.karmatics.com/stuff/cyborgdog.jpg

I didn't even bother saying "photorealistic", but I did give lighting hints:

"tricolor english shepherd future cyborg parts on head and front leg, very futuristic tech, replaces side of head and eye, black anodized aluminum, orange leds, big raised camera eye where normal eye would be, with colorful rich deep teal artificial iris, in worn future urban park with pond and stone bridge but pretty near dark with streetlight above beautiful dog and technology"