Answer:
A scale
A Human
A Car
A house
Step-by-step explanation:
There are various ways it can be achieved. Some of them are listed below:
1. Use a scale: You can use a scale similar to the one used in the maps to give a sense of the actual size of the mountain. Depending on the size of the photograph you can choose your scale.
2. Use a real life object in the photograph: Capture or include a real life object like a car, a house or even a human to show the scale. As we know that average height of a human is around 160 cm we can use that to show the scale.