I'm not sure specifically as I haven't read it. It could be about a character who has a red coat and various adventures or experiences related to that coat within the fanfiction world created by Quist.
Without reading 'a coat of red by quist fanfiction', it's impossible to tell exactly who the main characters are. However, it's likely that the character who has a connection to the red coat, perhaps the one who wears it or is searching for it, could be a main character. There might also be other characters who interact with this character in relation to the coat, like friends, foes, or family members.
To make the shift, start by analyzing the elements of fine art and trying to incorporate them into your cartooning. Experiment with different mediums like paints or charcoals. Also, take classes or look at tutorials to learn the specific skills needed for fine art.
One of the main features of horror one shot manga is the ability to build up tension quickly. They usually have a limited number of pages to convey a terrifying story, so the pacing is crucial. Also, the art style often plays a big role in creating a spooky mood.