My students learned to create an animal portrait to make it look like scratchboard. The students did a great job! Simple and just used Photoshop CC. Students had to learn to use layers and then add a layer with a photo of an animal of their choice and drop the opacity. Then they had to mimic the line variations in the fur to make the textures and form of the animal. I hope the information below is helpful. The results turn out really nicely and it works great for students that are new to Photoshop and drawing.
Here is the rubric.