Realistic twist and break-apart. How?

[masterton]

Hi I'm a Photoshop beginner who know the basics.
How could I make a realistic twist and break-apart of an object?
I tried to add cracks and let them separate, but it looks really fake.
Do you have any pointers? Thank you.

The image below is a sample.

 

[Argos]

Can you post your attempt to see what you can improve?