The importance of planning
The lack of subject matter is the reality for architectural visualizers. While a photographer creates art from what's available in nature, the architectural visualizer is faced with having to create everything from scratch, just like a film or stage designer. So, what will you show when you can show whatever you like?
Close-ups of the building facade or views of the whole site?
Worm's-eye view, a person's eye level, or aerial view?
Photorealistic or artistic watercolor?
Animation or stills?
Flyovers or walkthroughs?
Shadow studies?
Sections through the building, individual wings, or phases?
It's a bewildering array of possibilities, and the temptation is always just to launch in and start building.
How to begin with the end in mind
Many people (often including me) start right out, modeling everything they see in as much detail as possible and simply run out of time. Their presentation is unfocused and patchy, because having modeled everything, they sure as anything want...