Oh, it's just one of those things where you just happen to hit all the right chords. You can draw a million drawings, all equally good (in your own eyes, or at what people would agree to be the same skill level) and yet only a handful get that extra "something", that X factor, that really captures people's attention. It's intangible, so difficult to explain.
Some people just find the right groove and ride the lightning, like Eric Canete. It's like every piece they do gets that level of response.
I don't mean to be falsely modest, but I would never want to presume that I'd catch lightning in a bottle again either. Better to just keep my nose to the grindstone and continue trying to get better, searching for that wave that I can ride for a few decades. The journey is what it's all about though, so I'm happy.
If I remember correctly I used one of my Japanese brush pens for the line work [link] and then filled in the blacks with a Pitt pen Big Brush (I LOVE that big brush - it makes it so easy to fill in the blacks and yet, because of the fine point, I can still get it into tight corners). I should add, however, that I always adjust the levels a bit in Photoshop. I never go quite to bitmap; maybe about half way in between. It makes the line art sharp and the blacks black but doesn't reduce it to just black and white pixels. My levels usually are around 111/1/191.