not bad thought why add a drop shadow? and save png because you cant tell if it is actually as good as it looks.
The drop shadow ( 20% ) was to get some extra depth of the render. I saved it as a PNG so that you have the BG and the Render as layers! In PS it also looks great without saving. I did my very very best and I'm very satisfied with the end result.
On renders never us drop shadows and always make them transparent makes use of the render much easier. As for the cut, looks good, but you can't see any choppy cause of the drop shadow.