While my Dex isn't the neatest (the boxes in the background), I found that pattern much easier than Bunzo (the organic stacked parentheses). My engineering brain prefers order and logic to organic design, and I am having the most trouble with the more organic patterns. My Bunzo feels a bit more linear than others that I have seen, a fingerprint or signature if you will.
Additionally, I am noticing a couple of other signatures in my Zentangles - I have a very small comfort zone of stroke size. I prefer my strokes to be similar in length to what I would use when handwriting (my handwriting is very regular and the same size when I am on lined paper or not). This is leading to a more dense finished tile. I still benefit from the meditative state when I draw them, but I fell that my composition is not as pleasing as it could be. Looking back through my tiles, I have a very regular size for patterns with repeating strokes. I have a very instinctive and consistent 1/16" line spacing in most of my tiles.(It's even present in today's, the dark box in the center of Dex is a sixteenth of an inch from the edge of each box, with minor variations here and there and the bunzo lines are close to that in their centers as well.)
The other signature that I am seeing is something I cannot verbalize, but I can see a mental tie that says, yes, these two pieces were done by the same person. Kind of the way a graphologist could figure out if the same person was the author of two different handwritten items.
Am definitely learning and relaxing with this.
My shading in this is a bit odd. I think I may have shaded the foreground as if it was lit from the lower front, while I shaded the background as lit from the top. Still need to work on that light and shadow thing. :)