I looked at a half dozen or so designs. They are all fascinating.

I would offer some general advice for all groups:

1. Mars is very dusty, how does this affect designs of equipment, spacesuits, etc.?
   
2. What are people going to eat?
   How much food is needed for 6 people during 1.5 years? Where will that food be grown or stored?
   
3. Where is the water coming from?
   
4. Think in terms of integrated systems -- habitat, transportation, food, water, fuel, power, science samples, drilling, mining, etc.