Why is my render focussing on the front part of my project and blurring the background?

[tom.buckinghamshum]

So I am rendering my project but the final render comes out blurry as if its trying to focus on the front section. I really need to know why this is happening and how to get a sharp render. I am trying to render an emissive material that glows as well as a rubber textured one.

I am a school student and this project is due on tomorrow Monday 2nd August so any help would be greatly appreciated.

these are the renders so far

No details have come out

these are screenshots of my projects before rendering. As you can see these ones have much more detail.

[KristianLaholm]

Turn off "Depth of Field", that is whats "blurring" the render.

[TrippyLighting]

If you illuminate a translucent (sub surface scattering) material from the inside then that will always result in loss of visible detail as you loose shadows! Maybe turn the strength of the light source down.