making this wllpaper today 
Is that a transformer in the reflection?
I’d say you’ve got the material of the balls more or less spot-on if you were going for eye-candy.
However, at full size you start to notice how much of a distraction that the chromatic aberration and blurring can be, it would help if you toned it down a bit.
Yeah you should definitely tone down the dispersion in the “Lens distortion” node
Neat looking! But yeah, gotta tone down the dispersion a bit. Love the ball and chain though 