Great technique.          

gorgothon : Really ?
In fact, at the beginning, i wanted to center the column with the potion. But I am not endowed, from the beginning, I had badly centred the column, and at the end, I changed nothing lol

I think it would look a lot better if it was centered. The whole image is too close to the left hand side.

Thank you :)
I'm glad that all of you appreciate my little first entry for a challenge ^^

haha thats quite good and clever how you put the colours together

Its cool the column looks great and i like the gradient background.

The way you used the palette on the column is pretty amazing.  It would have probably worked better if you had more room to blend the colors, though.