I am currently writing a story and I have to make a movie with it. It's about wolves and hunters and I need to know how to add blood to my pictures.
The easiest way is to download some sets of brushes that can imitate the blood structure. Some of such tools are Bloody Tears, Shad0ws Blood Brush Set and Blood splatter bushes. The most convenient application to use the brushes with is Adobe Photoshop.