Is this convincing enough , or are the cuffs to rusty .
Let my hear your comments :eyebrowlift:
Well;
From a realistic view: I think its some very good rust, very realistic, maybe break it a bit up with some darker spots.
From an artistic view: Metal and rust spots would look better 
Edit: Btw the background steals to much attention, try either DOF, or making it darker.
Looking good. It’s a little too rusty, you’re right. You should have at least some of the underlying metal showing through.
I agree with guiseppe, the wall in the background looks like the primary focus. The lighting on the wall looks good, but you should light the cuffs better.
people may say the rust is unrealistic, but I saw a rusty guard rail that looked like that.
thanks for the replay’s
I try several other way’s to find a better texture, but it don’t working out like y have in mind.
Here the latest render. 
; it works fine for the chain , but the rest is not very convincing .I work on it.
First one is better! Just my two cents
The shot is so under-exposed that I simply can’t see it…
On all the rings and all the metal in general,
where sides of metal slide against each other the rust should have worn off a little.
eg. there should be ‘rub marks’.
also one of those ‘|||| day’s spent’ counting’s on the wall couldn’t hurt.
I think it’s a good start, but i also think that the pattern is too fine. My 1st impression was that it was rendered with indigo, or some other unbiased render and it was really noisy.
Looking good!
For some reason, their seems to be a disparity between the wall and the shackles, maybe have the shadow a little more defined on the wall?
My gut-instinct is that I really don’t like to see “featureless opaque shadows,” like the ones which appear on the inside of the front cuff in both shots. Blown-out whites and dark shadows “just look ‘wrong’” because your brain knows that in the real world it could see detail there.
I like the first shot better because the lighter region at the top of the frame, clearly leading up to a still-brighter area, offers a subliminal sense of escape. It also gives a well-defined “place for the eye to land,” which your eye does look for in any photograph.
The rust looks more convincing in the second version due to the color variation, though I agree with Felix that you should consider putting some “wear and tear” at the places where the links meet. Also, I notice that some of your links intersect each other, particularly on the left hand manacle. A very subtle thing is also that the chains seem a little floaty, as in they don’t look like they are being fully pulled by gravity, but this is only really noticeable if you stare at the image for a long while.
I agree with Felix_Kütt & flusheles, the rust is too homogeneous, what makes it unrealistic. Another thing is, that it has no effect on the wall at all. As if it (the cuffs) had been as rusty as they currently are, at the time when someone put that hook into the wall. Some more bump might also help in increasing the realism (of the rust), imho.
But it’s already lookin’ good, in general.
greetings, Kologe
Try a little sense of setting. All of it off-screen and therefore implied by the light.
For instance, that key-light is a baleful yellow light-bulb that’s grimy, so its light is of the appropriate color-temperature (actually look it up).
And it’s near dawn, cloudy, so a little bit of sunlight is coming in through the bars of the window and suggesting themselves on that wall, too. No fog. It’s overcast…
Apply such spices sparingly.
Thanks for so many replay’s.This experiment , still passionate my but for now I live it for a wile.
I don’t have enough skills to make it, like I want.I saw very good advices, and try many of them,but yeah.:eyebrowlift2:
A big thanks for the interested suggestions.Now I working on a more simple project, 
witch I show here soon.