Place shadowlines near the neck from the corners of the jaw. These lines nearly come together at the neck. Between the lines you can lighten if needed.
You can create a beard shadow using a Stubble Sponge. Hold the Stubble Sponge between the fingers and compress it slightly, so that it becomes a bit convex. Then work dabbing onto the skin: do not use a brushing motion, since you would remove the structured effect.