That's so cool! I love black and white detail work of all sorts! What's zentangle? I'll have to look it up after I'm done "steemiting". I Have a few ink drawings under my belt but most of my work is in drafting so not exactly a fun thing to look at but occasionally I get a chance to let loose. here's one of my originals you can check out:
(https://steemit.com/art/@ideaman/lets-trade-drawings)
Here's what I'm working on now:
(https://steemit.com/drawing/@ideaman/coin-art-series-1-2-3)
Hope to see more of your work!