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Tip for my fellow newbie digital artists: y'know how it feels "easier" to ink/darken over traditional pencil sketches than digital pen tools? Throw a Gaussian Blur over your sketch layer(s). Gives you a good guide for your lines without the "it's not a perfect trace" that comes from clear sketch lines.
I've been trying it for the first time on this Sylveon I'm drawing and I'm surprised how effective it is.