Humble assistance needed in the following article

[satyajitramachandran]

Studio/Institution: Wonder labs
Client: Mike railey
Genre: Industrial Interior
Software: Sketchup + Vray
Website: http://www.wonderlabs.org
Description:

Hey, ive just completed an industrial interior scene. Attached here with are the reference image and the rendered image. I would be obliged if any of you can please help me out in certain topics.

 

1. Better shadows.

2. More white balance.

3. Better sky.

4. More sharp and clear output.

 

Thanks

Regards