I tried to improve the random shackle/cuff/handcuff things I was getting from Pony, and found out it's tough to find good source material that wasn't photographed with a Polaroid in a dank basement in pre-2010. Seems like there'd be an uptick in degeneracy, but here we are.
This may or may not be an improvement, but at least it's consistent...ish. At least they're usually silver, and terminate at the wrists. They are also never fuzzy or have chrome spikes.
Useful words to put in your prompt are photorealistic, realistic, photo \(medium\), bound wrists, chain . The only real trigger word is real-handcuffs which may be a stretch.
Also, a tendency to put on thumbcuffs. Cute, tiny little handcuffs that go from thumb to thumb. But hey, that might float your boat, I ain't judging.
