Creating Nibbled Effect on Bread Slice

Start by opening an image of a bread slice.

Select clone stamp tool. Press Alt and click on white area to define the source pixels. Now click on edge of bread and start cloning the area as shown using soft brush settings.

Create a shape as shown using pen tool.

Double click the layer to open layer style window. Apply settings as shown.

From layer menu select layer style>>create layers. Select and merge all the resulting layers. Select burn tool with the settings shown. Now apply burn tool on left area of the eaten portions.

Double click the layer to open layer style window. Apply settings as shown.

From layer menu select layer style>>create layers. Select and merge all the resulting layers. Select burn tool again and apply on the right eaten portions.

Select and merge all the layers. Select stamp tool and apply it on the eaten portion edges to give final touch.