I posted this up on DA a while ago. This is a colored theme series starring TMNT character and some OC's of others.
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Leonardo is representing dark blue. This color represents knowledge, power, integrity, and seriousness.

Venus (in the back) is the color light blue. This color is associated with health, healing, tranquility, understanding, and softness.
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Blue:
Blue is the color of the sky and sea. It is often associated with depth and stability. It symbolizes trust, loyalty, wisdom, confidence, intelligence, faith, truth, and heaven.

Blue is considered beneficial to the mind and body. It slows human metabolism and produces a calming effect. Blue is strongly associated with tranquility and calmness. In heraldry, blue is used to symbolize piety and sincerity.

Leonardo/Venus © Viacom