tin foil is the boiling water

Without a bigger photo, we really can't see the image properly.
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Your image doesn't need to be enormous, anything between 2.5mg and 3.5mg is plenty big enough.
Good luck

nice set up and photo

the light on the left (candle) is distracting a little bit,
but for the whole theme, very inspiring setup

Thank you! I admit it's not perfect for me... Someone could make a better composition with the same elements but I didn't manage to...

Well done on your attempt. Other than the distracting light, the background is a little busy - I spent longer trying to make out the cigarette in the test tube in the background (reminds me of a year 9 science experiment). Anyway, in my opinion the simple backgrounds work best.

Thank you for the advice FallingHorse. And the "test tube" is a really nice thin bottle, but too high to stand up ^^
Seems that my picture is not on the road of "victory".

Lol author - in my view, the real victory is being able to accept constructive criticism for what is and taking a little something away from it. That makes you a winner already