This is an easy go-to rubric to use for a creative writing assignment. There are four criteria within the rubric:
1. content (in which students are assessed by how well they met the expectations for the assignment given)
2. originality and creativity
3. spelling, punctuation, and grammar
4. consistency with voice and style
For each grading criteria there is a description of each rating 1-5. The language is not specific to one assignment, and it can apply to any creative writing assignment. I've used this rubric many times.