Well, not sure if this should be classed as 2D or 3D - but given that I spent about 3 times longer with it in Photoshop than Poser, I've plumped for 2D; hope that's OK with everyone.

The base 3D render was produced in Poser using commercially-available products - what a time-saver! I then used masks to seperate out the individual elements into their own layers in order that they could initially be given some atmospheric perspective and some depth of field. This separation then gave me the ability to treat each element individually when it came to Photoshoppping the effects. I tried it with some cracks across the vision of the viewer, but it seemed a bit too much.

Made use of some free brushes by various kind souls. I especially like the "Watch" brushes by Chrissy79 at DeviantArts.