I love that last panel from "Who Is That?"! Reminds me of a woodcut. I think your hatching works great in black and white. I don't think scanning or shrinking is having a significant effect on your hatching - for the most part I can still see every mark clearly.
I think the other panels on that episode seem a little muddled because of how much hatching there is, especially with it butting up against and extending over linework (the house in the second panel).
I think the thing that makes your hatching so successful in that last panel is 1.) You direct your hatching consistently - this separates her figure (the hatching in her hair goes up and down) from the background (the hatching in the space around her hair is horizontal); and 2.) you use white and black space to highlight areas like her face or the darkness around it.
So I would try doing those two things more, and if that isn't enough, I would explore using value in the form of grays - use grays like you've been using colors, and you can do some really neat things!
I would not combine screen tones with hatching, if that's what you're asking. Those are two different forms of value and putting them on top of each other is just going to muddle things up.