It all depends on where on your eye you want to put it, and the desired result and finish you want it to be. Since you said mousse and smooth look is what you're after, im assuming that you want a fluffy, yet long lasting look. To achieve that i'd recommend using a fluffy brush regardless of where you want to put the shadow. This way it will give a weightlessly smooth look which seems to be what you're after. If you want to use it on the majority of your lid, I'd recommend a big fluffy eyeshadow brush such as the sigma E50. If you want to use it on your crease or to just blend out, I'd recommend a fluffy blending brush such as the sigma E25 or sigma E35. I find these give shimmery eyeshadows like the one you mentioned the best look! Hope i helped, im always here if you need anything and my pm box is always open. Have a great day! Xo