Speed.
Every so often, I like to challenge myself when I tangle. For this tile, I challenged myself to speed up from my regular slow-and-deliberate style. This mostly worked well, except for coloring the Knightsbridge. That was just slow so I wouldn‘t go outside the lines.
I also experimented with adding a bit of white highlights. I‘m not sure how I feel about them yet.
Zentangle drawn on Strathmore Vellum Bristol using a black, Zig Millennium pen.