If you want her tears to look like they're running through Mascara, there is a free Photoshop brush pack called "Pretty Blood" that make good tears.

 If you're using photoshop, the simplest way is to make a new layer for the tears, select which brush you want, size it and then make the brush black. Then play with Opacity.

 Also, the great thing about working with layers is you can edit the layer as much as you want without affecting anything else in your picture.

 If you'd like, I can go dig up the site where I found those brushes for you.

 Hope this helps!

Alright voices. Either you all learn how to take your turns talking, or I keep ignoring you. My head echoes too much for all of you to be shouting all at once...