Designing in any format, any media, is about asking questions. Without questioning what you are designing, its function, its use, its place in your world you will never end up with anything of true substance. Ask who, what, why when and how then ask again. Challenge your preconceptions of what it is you are designing, ask why you are designing it the way you are, challenge your own ideas, be self critical. Is the thing you are designing functioning the best way it can, could it work another way? Is the thing you have designed what you believe to be correct within the world it is designed for? Question, question, question.