Your final projects are really diverse, they range from cartographic design and 3D models to questions about health, the environment, and urban economics. The diversity of projects makes it it very hard for me to establish formal guidelines for length and content. In my eyes a good project is one that tries to answer and interesting question with GIS. This does not mean that your project has to be a series of maps. To answer your question will need to interpret your maps and data. If visualizations like maps and graphs will help me (or other readers) understand your argument include them, otherwise do not. Its a good idea to have at least one map, describing the place and or data, but you don’t have to go overboard. Even if you do not include many maps you will have to explain any GIS procedures you used to answer your question, I will be grading in part based on the level of GIS competency demonstrated by your project.
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Good Luck!