In India art is always symbolic and you will find a softness in its painting and sculpture. see Ajanta paintings. All lines are curved smooth. Blue colour is just symbolic. It has been associated in many different cultures and arts with devinity.
The Kangra school of paintings of Raga Vasantha portray a fair-coloured Krishna..... while Ragamalas from Bundi show a blue-coloured Krishna in yellow garments playing the veena.
In Tagore’s colour symbolism blue is existence, blue is roop, blue is lavanya, blue is anandablue is roop, blue is lavanya, blue is ananda.
Blue and yellow form Tagore’s favourite colour contrast
The interaction of colour and the five elements — earth, water, fire, air and the sky (akasa) — illuminates not only several disciplines such as Indian philosophy.
Blue stands for a sense of strength and power or force. it is colour of depth; of nature. ocean sky everything is a shade of blue.even fire has this shade.
Blue is the colour of the firmament, the sky and therefore of paradise. It symbolises divine truth and wisdom. The gods come from this colour: Osiris, Krishna, Vishnu, Buddha, Zeus and Yahweh rest their feet on the firmament. This blue celestial veil hides "the other side, the divine unknown", it is the cloak which "covers and veils the Divinity". Blue attracts man towards the infinite, wrote Kandinsky.
It is a fixed, cold colour encouraging meditation and rest oriented towards God.
In Tibetan Buddhism blue is the colour of transcendental wisdom and vacuity which opens the door to freedom.
Blue is the colour of Yang.