Syrena is a vodka brand based in Poland, and Luks Piekut was charged with coming up with the package design. Judging from the details he used, it looks like he turned to the ocean for a bit of inspiration.
The neck of the bottle has the tip of a whale tail that appears to be jumping into the vodka. Below this, at the top half of the bottle is a blue patterned look resembling fish scales. The further down one looks, the bluer the color is, which is reminiscent of the effect of going deeper down into the ocean depths. To solidify this ocean look, even the Y on Syrena looks like the tail of a whale.