An alternative to the traditional pen & ink drawing involves using grey ink along with the black for more nuanced shading. Here I used Faber Castell's Pitt range of fibre-tips. The shades of grey set comprises 6 pens going from cool grey to warm. Personally I prefer the warm colours and find them more useful for the subject matter I tend to concentrate on.
Here I started with the lightest grey, blocking in all but the areas to be left white. Then the darker shades can be applied to build up the shadow.With my small pocket sketchbook I only had room for the bell tower...