So yeah, I finished the mosaic, painted the skin and the bikini. Then I started to highlight the white separation of light between each shape in the water, before I would do a first glazing of blue. But there, again, I didn't expect this stage to look so cool. Not very realistic, but surprisingly pleasant. With the feeling of a light wave coming from up right. Really liked that.
But hey... Couldn't resist to explore further the day after. Sorry guys. This one unfortunately vanished from the physical world.