Full cream milk can be used to make it more rich and creamy.
The amount of vermicelli can be decreased or increased as per the liking. If you add more vermicelli the consistency will be much thicker.
You can add saffron or rose water to the pudding.
Nuts can be added as per your choice like unsalted cashews
Pudding tends to be thick when cooled. If you don't like thick pudding then add some more milk to it while serving it warm or cold.