Its.... ok, you will still not get a very shard edge, but it will be a straight one at least.
If you want to get a sharp edge highlight, use the side of the tip, not the tip it self, this is the best way on a edge.
Here is a great example, but use a brush over a pencil... Unless you want to use a pencil XD
Here is a 10sec video with a brush https://www.youtube.com/watch?v=Z-r57b-TPAU
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