Click on the image on the right to see the entire sketch at super-high resolution.
Below are my comments on specific details.
I thought this base turned out well. I find it easy to draw architectural details. But these are weird shapes since they turn back in octagonical perspective.
The leaves are also cool. Scribbles work surprisingly well. You can make out two different kinds of plants.
And I like how the sketch fades off to the left. This is the railing around the fountain at Madison Square Park.