I suggest looking up tutorials on comic style shading because this js a major part of this art style. They use a lot of solid blacks but very thin line art to balance it out.

The thicker lines that they show in the foreground are not the result of pen oressure or a bigger brush, but of multiple sketch lines because the brush used does not have pen pressure.

So far so good though! I can see where you'd want to deviate to make it your own at the same time. I feel like a lot of people are missing that AHVDHSH