What is Big ?
BIG means large in size, height, width, or amount; huge or massive.
What is Small ?
SMALL means little in size, esp. when compared with others of the same kind; not large or big; limited in size.
Picture 1
In the picture given below ,
Yellow Dianasour is BIG and Green Dianasouris SMALL.
Picture 2
In the picture given below ,
The ball on the left side is BIG and the ball on the right side is SMALL.
Picture3
In the picture given below ,
The Elephant is BIG and the mouse is SMALL.