Tip 1:
One really good trick that I learned for putting eyeliner(eyeliner tips) on your upper lid is: you do lines as if your connecting the dots like this: - - - -; and then once you have your upper eye lid like that, you fill in the missing spaces and you have a straight line! I'm sorry i described it so badly, that's the only way I know how to. Hope it works for you guys!
Tip 2:
I close my eye almost all the way and tilt my head back a little so I can get close to the lashes when I apply eyeliner. I really like NP Set eyeliner from target, it's a little pricey at $17,(I got mine on clearance though) but it doesn't travel like most drugstore eyeliners do.
Tip 3:
When doing cat eyes, always use liquid and aim for outside of your eyebrow... that always seems to be a good angle.
Tip 4:
I pull my eyelid outward at the corners to make them taut. I think I get a straighter, thinner line this way and closer to the lash line too.
Tip 5:
If you line your top inner lid with black, it makes your eyelashes seem fuller. I love doing this when I don't particularly want to wear mascara :)
Tip 6:
I use a small, angled, eye liner brush to brush the same color eye shadow as the liner over the liner. It makes it smoky, vibrant, and it never moves. You never have to reapply. here is one, but you can find cheaper versions at Target etc.