I started these series of buildings sketches back in November. My intention was to be able to sketch buildings. Since completed 30 of them I feel somewhat comfortable. Most of the sketches were based on photos from Pinterest or Flickr. Only one is onsite. I started off with a Faber Castell Sepia S nib. Love the brown. And then later sketches were done with a TWSBI Ecco fountain pen filled with Noodlers Lexington grey ink. A big difference from working with straight black.