How can I add crack to a picture in Photoshop cs5 (with or without using custom brushes) like the one below?
I tried with brushes, but it didn't look realistic.
Step by step, assuming you have used Photoshop:
Alternative, you can use a crack brush such as this one:
The 'making it realistic' part is up to your Phothosop skills. Unfortunately, there's nothing we can do to explain this part. It comes with practice.