The Na'vi don't have eyebrows. While you could just paint your makeup on over your brows if you don't have prosthetic appliances to cover them, a neat trick is to take a giant glue stick (or the spirit gum) and go over your eyebrows with it, rubbing the stick in the opposite direction of eyebrow growth. Let it dry and then do it one or two more times (depending on how thick your brows are). With your brows flat against your skin with a layer of "glue skin" over them, you can have a nice, flat surface to apply the makeup with, without worrying about any facial hair peeking through. Apply blue cream makeup in thin layers to your face, neck and chest. You can also blend some of the makeup up and around your Elf Ears on your forehead/temples, so long as they're dry to get a smoother look. If you feel like you need more "blue" coverage, apply another thin layer. It stays on better to do it in stages and doesn't look like you just glopped it on. Mix together some white cream makeup with the blue to create a lighter shade. Use one of your paint brushes or makeup brushes to apply it in thin stripes, concentrated mostly at the temples of your face, then drawing it outward in thin stripes. To give the broad, alien/cat like nose that the Na'vi have, take the lighter shade of blue and paint directly down in a straight line from the inner corner of your eye to outer edge of your nose. Blend it with the brush. Repeat on your other eye/nose area. Then, take the light blue mixture and paint a stripe down the center of your nose, blending a bit for a "highlighted" effect. Add the lighter blue makeup around your eyes and blend with the darker shade. Then do some "zebra stripes" with the light blue on your forehead, extending up from the bridge of your nose. Take a skinny paintbrush or makeup brush and dip it in the plain white cream makeup. Dot it along your forehead and cheeks below your eyes to create the "freckles" the Na'vi sport.