Try this for sight picture:
Stand in front of a mirror, close one eye and stare into the mirror's eye. Now move your index finger which is pointing towards the mirror from side to side. Keep staring at your eye. This is the sight picture.
Now stare at the tip of your nose. Your nose is now the target, bring your finger (which is the gun's bead) to your nose.
This is the sight picture for breaking targets or birds. Try it with both eyes and you should see a bigger picture.