Lale's Traditional and Digital sketches!

[Lumens]

Well its a long and drawn out way of saying that caustics do not appear in deep water or with the absence of sunlight. Given how intense the blue hues are i thought it might be fairly close to the water surface.
And you're right both about taking artistic liberties and questioning critique which is always better than to go with the usual thanks for the feedback and proceed to do nothing with it.
( i've done that a fair share myself) Keep up the good work!