Creating Scars

Scars, like tattoos, are image files overlaid on your orc character. They don't apply color to your orc's skin, though. They create texture on your orc's skin.

Getting Started
Familiarize yourself with Creating Tattoos. The tools you use to create scars are the same. The techniques you use to apply scars are the same. But scars are much more subtle, and you have a much more restricted tool set in creating them. Depending on the scars you're designing, you may want to combine them with translucent tattoos to "tint" the scars and give them a more naturalistic appearance.
Scar inspirations
Scars on the human body take two forms: raised (hypertrophic and keloid) scars and sunken (atrophic) scars.
Hypertrophic scars take the form of "bumps" on the surface of the skin. Their edges and texture are quite rounded because they're caused by an over-production of collagen while the wound is healing. The ritual scars on Eric Killmonger in Black Panther are hypertrophic scars.

Atrophic scars take the form of "valleys" on the surface of the skin. They can have distinct and more sharp-looking edges than hypertrophic scars.
Both atrophic and hypertrophic scars can form naturally, or can be intentionally encouraged by a number of techniques.
Figure out what story you're telling. Does your character come from a clan where ritual scarring is practiced? Does he have majestic battle scars? That's going to guide your design process.
Creating your scar
Tattoo files can have any color you can paint. Scar files are grayscale. Black is deepest. White is highest. The grays in between can create different heights in between.
To create sunken atrophic scars, you're going to want to start with a white background and create your scar image on it in black.
To create raised hypertrophic scars, you're going to want to start with a black background and create your scar image on it in white.
That sounds simple until the background covers up your layer template. You need to create your scar in (at least) 2 layers. Create a "Scar Background" layer on top of your TatGuide layout layer. Fill it with your background white or black. Then hide it or make it translucent so you can see the layout template.
If you're creating raised scars, you may want to also create a throw-away "helper" layer with a translucent red or blue background. That can make it easier to see the white scars you're laying out on the template. White on gray isn't always that easy to see.
Scar depth
Scars rarely have purely vertical edges. Learn to use your image editor's blur tools to soften scar edges. The "Gaussian Blur" tool in Photoshop gives you a great deal of control over how much blur you apply.
Atrophic scars may just need a pixel or two of blur one time to create an edge that's not too sharp.
To create the "rounded" look of hypertrophic scars, repeat a small blur over and over to blur the edges of your scar more without blurring the center.
