The two-stage process applies to microblading + manual shading just as much as it does to microblading alone.
Here we see a fairly sparse natural brow. At this client's first treatment, I applied both microblading hairstrokes and some manual shading.
Even the client returned 4 weeks later for her touch-up, we both felt the color fading was just right. However, in doing the touch-up, I added a tiny bit of warmth so that when it fades out, there won't be any hints of ashiness.
During touch-up, I place the new strokes in between the old ones do as to avoid scar development or thick lines. The result is a full brow that might not need more manual shading. However, because this client's natural brow had such a thin tail, we decided to touch up the shading as well, focusing on the tail and going lighter toward the head, resulting in an ombré look I really like. Hope you do, too!