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I've been asked to do a blood tutorial... so here goes.
Blood is really just a three step process.
1) Take a dark red, crimson preferably, and draw the general shape of the blood. I usually find a couple places were I want there to be lots of blood - whether from another person or from a deep wound on the avvie, and darken those areas in first. Then, I add the splattered and smudged blood. This will be thinner and smaller, as well as a bit more sporadically placed. Also, note that blood will smear on clothing, so when drawing blood onto avvies note where the blood will seep onto the fabric or collect on top of folds. Rivulets of blood should start thick and then thin out. Dripping blood should not be in droplets but strings, it's more noticable.

2) Second layer of color will be bright red. If you want the impression of dried blood, go very very easy on this step and skip the third entirely. But for fresh blood, you'll want to highlight. Keep the bright red near the center of the blood patches where the blood will be thickest. Also highlight on edges.
For this avvy, I chose to make the pooled blood at his feet and the blood on his shoulder dried.

3) Final stage. Take a light red-orange and add just a couple pixels of bright to the fresh blood splatters. I usually use a pencil tool for this and rarely use more than three individual pixels next to each other at a time. This is just where the light is going to make the blood appear shiny.

And you're done! Some examples of finished blood:

Blood is really just a three step process.
1) Take a dark red, crimson preferably, and draw the general shape of the blood. I usually find a couple places were I want there to be lots of blood - whether from another person or from a deep wound on the avvie, and darken those areas in first. Then, I add the splattered and smudged blood. This will be thinner and smaller, as well as a bit more sporadically placed. Also, note that blood will smear on clothing, so when drawing blood onto avvies note where the blood will seep onto the fabric or collect on top of folds. Rivulets of blood should start thick and then thin out. Dripping blood should not be in droplets but strings, it's more noticable.

2) Second layer of color will be bright red. If you want the impression of dried blood, go very very easy on this step and skip the third entirely. But for fresh blood, you'll want to highlight. Keep the bright red near the center of the blood patches where the blood will be thickest. Also highlight on edges.
For this avvy, I chose to make the pooled blood at his feet and the blood on his shoulder dried.

3) Final stage. Take a light red-orange and add just a couple pixels of bright to the fresh blood splatters. I usually use a pencil tool for this and rarely use more than three individual pixels next to each other at a time. This is just where the light is going to make the blood appear shiny.

And you're done! Some examples of finished blood:


