In the image we can see two major areas of focus: Gandhi to the left reading, and his spinning wheel to the right. Gandhi himself is a symbol of the Indian independence movement and non-violent movements in general. More info on Gandhi's historical significance can be found in the background history section. The spinning wheel is extremely symbolic, Gandhi himself had said the wheel was intended to inspire Indians to make their own goods rather than buying from the British, so it was a symbol of independence and self-rule. The symbol has become a defining symbol of India as a whole, as it's the centerpiece of India's modern flag.