For a first render its not bad at all
Cycles isnt all that easy to understand, with all the material nodes etc...
Did you try to make the chain chrome?
A few tips that i can give you:
-Never have a texture that is smaller than the resolution of the render cover the entire thing, its often better to tile the texture so that it repeats itself.
-Try to add some detail to the table/floor by using a bump or normal map.
-Make sure the background is not visible(gray top left and something else top right.
Great first try though!