By using your mag you can work faster and more efficiently. Instead of switching from liner to shader, use your mag to block in your larger shapes.
I will often use the side or edge of my mag for smaller details, fur, hair, and other textures. You can also use your mag to line out softer edges.
By using the mag flat you can achieve solid colors, or smooth shading. For both you want to use a a consistent and deliberate motion.
Once I have everything blocked in with my mag I will go back in to refine with a liner or smaller grouping.
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