There are two basic ways to apply eye shadow in shape shading, “rounded” and “winged”. Now you want to determine what is the best shading shape in your case. You can try applying one shading shape (rounded) to one eye and the other shading shape (winged) to the other eye (this would save you time). Then go look in the mirror and see which one looks best on you.
Experiment and try all the different shading. You may be surprised to find that several of them may look great on you (the rounded technique seems to look good on the majority of women).
If you don’t have much room between the eyelid crease of your eye and your eyebrow then apply eye shadow using the winged shape (unless there is some sagging).
Looks best where the skin towards the corner of the eye is not sagging such as on younger women because their skin is still firm.