Favored by God

So. You want to do some vector lineart on your uploaded sketch in photoshop. All you have to do is draw a vector line on your sketch, set a brush, hit 'stroke path' and you have a satisfying line, right?

WRONG.

Why? Because the resulting line is the same weight all the way through. Even if you use varying widths for different lines, your line doesn't add definition to what it is trying to describe.

Okay then, what about hitting the "simulate pressure" button, you say?

Still wrong. The simulate pressure does taper the ends of the line, but does not add any extra weight to the line where it should be there.

So what is the solution? To take the matter of the lines into your own hands. That is, to, instead of drawing vector lines, to draw vector shapes and fill them in. It takes a longer time to do, but it's more worth it in the end.

Okay, so here is the original sketch that I will be working with.

It's not a sketch that is actually well-suited to vector tracing because it's shaded, not to mention it's low resolution, but I will try anyway.

This is messier than how I usually do it due to the low resolution, but here's an example of what I mean. (with a 25% white filter over the sketch)

As you can see, the paths form the shape of the lines rather than the lines themselves. By doing this, I can completely control the shape of the line.

When you fill in the path, your path should look like this. Also, where subpaths overlap, be sure to be careful of what overlapping mode the path is in. By default it is "exclude overlapping path areas", here I have it set to "add to path area" so that the overlapping areas aren't excluded.

Here's how the lines will look filled in, and the path deleted or unselected. (with a white filter of 50%) Here, you can see that the lines define the shape of the eyebrows (a little too craggly than I wanted but ok), and the mouth. You can't do this with just stroking linear paths.

Not the best vector lineart I've done, but you get the idea.

And no, I'm not finishing it.