Spelling is important in creative writing. Grammar, for the most part, in regards to comma splicing and other various forms of punctuation are largely left to creative license. The only correct way to grade any piece of creative writing is for spelling errors. Even an incomplete sentence can be correct in creative writing.
For example:
He knew what was coming. Death. He walked down the dark hallway towards the door. His breath quickened. He reached for the door knob. Heat. Fire. His eyes widened as he knew the way of his demise. He gritted his teeth. Burning.
"Such a horrible way to die," he thought to himself before smiling and opening the door. Letting death in.
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The above little snippet I just wrote is 100% grammatically correct according to typical creative writing rules. I added in several incomplete sentences and even a run on, but it's still correct.
Edit: If you would like for me to grade them I will. I have taken three collegiate level creative writing courses. Got 2 A's and a B. I changed majors away from English with a creative writing concentration since I didn't want to work at Starbucks, but I still love writing.
