To apply eyeliner, I suggest using or Smudge Proof Liquid Liner, pull the lid skin taut and getting as close to the lash line as possible, glide the liner along the upper lid. Try starting at the center and working your way out and then go back to the inner edge and connect the line. You can even dab a few dots on the edge of the lash line and then connect them together.
When using eyeliners, I prefer using shades of black and brown. To add extra color, you can always "smoke out" the effect with blue, green, wine or other colored eye shadows. Using color this way still achieves the effect of a liner and with added shimmers, gives a softer look.