Theres not too many different ways to actually do your eyeliner...you can go thicker, thinner, or flare it out past your eye. What makes a difference is ifyou use liquid or pencil eyeliner, liquid gives a bolder line, pencil can be thin or thick and you can also smudge it. You can experiment with different color eyeliners also.
it depends on how your eye is shaped because if you have a small eye you dont want your eyeliner to look smaller and if you have big eyes your dont want your eyeliner to make it look bigger
You can do winged liner, or a double wing. Use colored eyeliner to look more fun. Like purple eyeliner or silver. Those tend to look very pretty.
you can always use colored eyeliner ^^...random tip- you can get white eyelinr and put it along the bottom of your eye to make them look bigger ^^
Designs are always nice. Be creative. ^.^