Pink or green (but not togther) would work best.
Depends. A light blue 💙 is lighter than a dark red ♥️.
A darker blue Navy
A darker shade of blue.
purple
A darker, grayer color.
the outcome should be a darker (more blue) shade of green.
Nothing will happen to the colour of the shadow. A shadow is the absence of light, and the object will still block the blue light.
blue
Golden yellow, green, or, less often, blue.
They can be any colour really but normally they are slightly darker than dolphins (that is the blue dolphins)
Winston Churchill had light blue eyes.
Ed Sheeran has blue- green eyes. They are mostly blue though.