Quick; look at an interesting building, and then sketch it. No pre-sketching allowed, and only a minimal amount of pre-visualization employed to ensure that everything fits onto the page, and then just draw and color everything in your path. Such was the case with this building, which is the Tanzanian embassy here in Washington, DC. I did this sketch in about 30 minutes. Not only was it good practice for drawing buildings, it also helped keep my incessant perfectionism at bay.