How to make cracked effect on the glass
You might have seen a cracked glass, now you have a chance to learn how can make this effect.
Picture: First take a picture of the glass, I have taken here a jug picture.
Selection: Make any type of selection by the polygonal lasso tool as here.
Layer style: Go to Layer menu > Layer style > Inner shadow.
You will get it.
Filter effect: Go to Filter menu > Distort > Ripple.
You will get it.
Layer settings: Now change layer settings as I have done here.
Levels: Go to Image menu > Adjustment > Apply Levels.
This is the final result.