Changement de couleur

I think something is getting lost in the translation here, because there is no colour in the cloud.  Everywhere I sampled was different shades of grey. 

"Hello, I'm looking to copy the color effect of the cloud in the drops but I don't know how to do it? "

Above is the translation. If you are looking for click and copy of effect from one object to another, as it can be done using a color sampler for colors, then I am afraid it is not available. You can duplicate or copy/paste layer effect or smart filter. If none of those are used to effect clouds, then use another technique like clipping a mask. Duplicate the cloud, then move it downward and clip it into drops.