A scene I’ve been working on for the last couple of days in 2.58a Comments welcome, let me know how I could improve this!
interesting, although I think there is still alot to be improved, the screws dont look too realistic, and as far as i can tell i think it needs a bit more/some ambient occlusion.
You’re right there sir! I had no ambient occlusion turned on, so far I’ve only got a simple 3 point light setup. Better lighting is on the table, I just have to get around to it. As for the screws, they’re just a first attempt…good enough for me to put in there, but yes, definitely in need of more time put into them. Thank you much for your comments. 
Also, maybe try rendering in an external renderer, such as the demo of octane render or luxrender perhaps, it would improve it 100000%