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To make the image more vivid, try adding some steel gears. Start this by defining the gradient (multi-stop, greys, with a shade of blue). Apply the gradient to some wheels. Put the steel gears in the device (just take care to not couple steel gears with gold gears: Place the axles in the center of the gears and we are set. Add some screws holding the device. Distribute the screws evenly (or randomly if you feel like it) and it's done!
Here is one trick to get some of the wheels richer, not that plain and boring: add a groove - two smaller circles, aligned to the center of the gear, filled with the same grey gradient, the larger in an opposite direction, the smaller in the same direction as the rest of the wheel. steel with steel and gold with gold). Now for some axles: small circles, made from gold, steel, ruby or sapphire. Do not forget the drop shadow and consider a white highlight.  They are easy to do: create a steel circle, subtract a rectangle to create the groove, add a darker steel rectangle, the bottom of the groove, rotate the screw to a random angle (we don't want all the screws to have parallel grooves, that would be repeating and boring), fix the gradient and add a drop shadow. Maybe a hole: a larger circle colored with the same gradient as the background but with an opposed orientation. (I increased the zoom level in this step for a clearer illustration)