There is a popular misconception that creative writing, as a creative process, is above criticism and academic rigour. This is utterly false. Criticism is absolutely necessary to improve any work, and the imposition of academic standards can greatly improve the quality of a work. This being said, as the author you have complete control over your work. If you feel that the violation of grammatical conventions improves the work, do it. Creative writing also requires dedication. You must be willing to put time into a work, to edit it, and allow it to be edited. Beyond these, few absolutes can be drawn. Different people write in different ways. You need to find a method that works for you. Finally, the broader your knowledge of the language and the more that you have read, the better your writ