Eye primer is super important to keep shadow in place all day with no creasing.
Brushes are everything, a compacted poof brush (crease brush) will buff the shadow flawlessly.
Younique has amazing shadows that are pressed and very pigmented. A little goes a long way!
Buff the shadow in the crease of lid (in a half moon shape) avoiding top of lid.
You can use a little more to build up the pigment as much as you want for depth.