I think this drawing of Lincoln Cathedral is very well done - first of all, architecture is difficult to draw well, requiring quite a bit of care to end up looking neither wonky, nor mechanical.

There are a couple of things that catch my eye about it, other than points already made.
One is that the central tower doesn't really recede behind the western towers, despite having the length of the nave between them - this sort of appearance is characteristic of views through telephoto lenses, and I'd guess this is drawn from a photographic reference taken with a long lens. Its difficult to take account of this, one approach might be to decrease the contrast on the central tower, and increase it on the west towers and west front, to try to give some sense of separation in depth by aerial perspective (things become less contrasty with distance dure to light-scatter by intervening atmosphere).
The second problem I see is that while the cathedral is due to the complexity of its decoration appears to be rendered in light and shade, the houses in the foreground are drawn in line. I'd suggest they might draw the eye less if they were rendered in different values of shade to show the different walls/roofs, rather than being delineated with black edge-lines?
Any help?
Dave