Render doesn't really blend and the the signature is wayyyyyy toooo big. Also get rid of the bevel on the signature and add a normal border instead, also the colour scheme is off.
the background is great and well the render just doesn't match it at all... try to get the render blended better with the background but for now it gets a 3/5 for a great background
Okay so I'm not really getting the fog feel so to do that make a new layer on the top, brush where you want the fog with a soft brush (try to use a light grey or light grey and a slightly darker grey) and then go to filter>Blur>Gaussian Blur and then lower the opacity and you have fog! Also sharpen the render once.