3D Model - Classic Pocket Watch

I've been trying to blend my 3D models with real-life backgrounds for a project I'm working on.

So this is the first attempt using my pocket watch model I made a few months back. Original version can be seen here: [link]

The model hasn't changed much, basically just a higher poly count and a quick mess around with the lighting effects and camera effects such as depth of field to match the scene.

Any suggestions to help improve this and make it more realistic would be very helpful thanks.