also when you create a material you can save this and reuse it in the next projet. you can also do your variations and save it or you can start from a library material and modify it and save the variation to a new material..
so why not?
Not bad, I've seen maxwell do some amazing things though, explore the program some more. Remember renderings aren't just "renderings".. that image itself tells nothing. Think of it as a picture and how the photographers eye would see it. That was my first pointer and it has worked.