Modern interior architecture

Charcoal is good for this kind of architecture because it is easy to show the reflected light and subtle shadows in a bright environment that is quite minimalistic. For example this is a drawing of part of a modern attic room where there is simple build structure with a window, and under the window you can see the light on the large beam reflecting and slowly dropping off as the window stops.
This angle was good because it helped to show the foreshortening that was present along the large beam under the window which gives the drawing depth.
There are both extremes of tone in this image, the bright non-coloured window and the black shadows under the beams where the light isn't hitting as much as in other places. While the beams aren't actually that dark, it makes the image more interesting to look at. It is also an interesting angle because of the window in the rule of thirds and the flow of the beam all the way across the page.