I usually take time to frame my shot before I take it, giving a good look at the viewer to see if what I have is what I want. Yet, very often I find a judicial crop improves the image. I chose these examples to show the value of edges and the strong lines they produce and which can make, or break a composition. In each case I also limited the range of colour to place more focus on the image created by the edges.
In cropping this image I ensured that the diagonal lines did not exit at the corners of the frame – generally speaking, avoiding this makes a more pleasing image.
In this one I liked the meandering, angular line the building draws against the sky and the dark rectangles are additional interest.