Here's my 2nd sketch with this combo, a fabric study. Getting more used to the inversion of value and also staring to use a little more sketchy approach, the white Conté moves around and erases pretty well.

Hey Christopher. Nice job! White on black is very different/difficult. I love how cleanly you've depicted the plain changes here. I've done a few of these with varying results, but it's always fun and when done well the finish can be striking. I like using a white prismacolor pencil and meticulously outlining or mapping all the value shapes I see in the reference, then kind of filling them in with different hatching. It can become very abstract and designed, almost mechanical looking. But it is awesome. I need to do more! You too. Keep it up.