How to create a person looking through cracked glass on Photo Shop.

 1. Select your chosen image of a person and of cracked glass.

 2. Place the glass over the picture and change the mode of the layer to screen.

 3. Now use the Polygonal lasso tool to make an even bigger crack into the glass so that the persons face is visible.

 4. Press Alt and create a new layer mask for the cracked glass layer.

 5. Drag on a grey coloured photograph to fit the size of the picture.

 6. Change the opacity of this grey photograph to about 45%.
Then press Alt and drag the layer mask into the layer for the grey photograph.

 7. Go to > add layer style > Bevel and emboss.
Select > chisel hard.

Your final image should now look like this.