Choosing a mascara these days can be pretty tough, especially when there are so many choices. Mascara generally comes in three forms: thickening, lengthening, and defining. So, you want to ask yourself, "Do I want thicker, longer, or natural lashes?"
With mascara, don't feel like you have to go out and by the expensive brands at the department stores. Save your dough and splurge on other things (like foundation and powder). Afterall, mascara should be thrown away after one month anyway.
Here is the trick for achieving thicker or longer lashes:
For thicker lashes: Hold your wand horizontally and start at the root of your lashes. Wiggle the wand back and forth all the way to the tip (in a horizontal motion). This will thicken your lashes from the root to the tip. Repeat this several times to help separate the lashes. But don't dip the brush back in - this will create a lumpy look.
For longer lashes: Hold your wand vertically and apply from the base up. This will deposit most of the particles at the tip of your lashes, making them appear longer.
Don't forget to use a lash curler.