Textures did 90% of the job, it looks really realistic - almost like a photo.
A curiosity question - what is the main thing in the scene called?
It looks a hybrit between tripod, cooler and astronaut.
Also I'd do a bit less DoF in the scene, at least on the background (i wanna see more details -> do you have non-DoF version of the scene?) - but all in all image looks very good, composition is okay, lighting looks cool, except for little jaggies on highlight areas.