i use a putty knife.
First, use a concealer brush to apply the powder concealer where you need it (under eyes, spots, etc).
Then put a little of the foundation into the lid of the jar (or a small dish) and swirl your brush in it so that the foundation goes into the brush. Then buff the brush in small circles all over your face.
To apply blush, pick up a small amount of product onto your brush. Tap off the excess. Apply the blush on the apples of your cheeks. If you want to contour, take a darker shade and apply it under your cheekbones to define them and upwards towards your temple.
For the finishing powder, just dust it loosely over your face with a big fluffy brush.
EDIT: I just noticed you were talking about the L’Oreal stuff which has the brush on top of the product. I don’t particularly care for the packaging because I like to use my own brushes.
There’s a video on this page that shows Eddie Maleterre applying it -
Either way, the trick is to buff and blend, blend, blend!
first put on the concealer on problem areas (under eye, pimples, etc)
then foundation all over your face
then blush on your cheekbones
then use the finishing powder to set your makeup. all over your face.