I thought that something was obviously missing from this picture. Collars are not enough to properly control them.
I used a single image of a chain, which I scaled and skewed so that it will connect between the collars. I thought the varying width of the chain would be acceptable, as the chains do that a bit, but I exagerated the chain that is closest to the camera too much, so it looks paper thin. I shaded the chain, but I didn't add a shadow being cast from the chain, as that would take a lot of work, and there is no direct light coming from that direction.
Also, I thought the image of the chain would be okay, but maybe it looks a bit too cartooney.
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