Well, it may be a quickie, but this is =MixedMilkChOcOlate at his best - simple, elegant, and amusing.
Looking first at the palette, it's really aesthetically pleasing, and the range of hues is really nice. You can see the use of opacity, and the light-dark gradient blends really nicely - just like water. And, to point out the obvious, the edges match up too - so it works on a bottle!
Naturally, the emotes are made in a sleek vector fashion, and their expressions are fitting to the design. Perhaps a wider range of expressions could have been attempted, but personally I like them how they are.
I'm also wondering if it's possible to maybe add some shading, or sense of perspective to the actual bottle template, but it's only a minor quibble.
Great stuff Nico - I know I'd certainly buy a bottle!