Refining the product starts with validating with users that they find value in what has been created. It's OK to be off here, as that's the whole reason for keeping things minimal up to this. After testing with a group of users, I then synthesise my findings once again to inform changes to the product. This cycle of build/measure/learn will be repeated as we continue to validate with users that we are on the right track. As the direction solidifies, visual design and polish make their way in.