This is my rendered final piece with added textures, I attempted to add ambient occlusion, but failed ad the UV's on my final piece are overlapping each other which prevents you from adding ambient occlusion.

I also made this, which is an experiment to show what a scene would look like when ambient occlusion is applied. The ambient occlusion worked on this scene because I moved around the UV's so they were not overlapping and the applied the ambien occlusion, I then messed around with the setting to find something I was happy with, then rendered it.

This is a screen shot of my UV's for my Final piece, there all overlapping and messy and this is why the ambient occlusion wasn't working when I tried to apply it to my Final piece.

These are the UV's for the models that I successfully applied the ambient occlusion to and as you can see they are all neat and positioned equally which is why the ambient occlusion was successful on this scene.