Since it's a graphic novel, 'pumpkinheads' could have a really visually appealing story. It might be set during a fall festival or in a pumpkin patch. The plot could revolve around the daily lives of these pumpkinheads, their traditions, and how they interact with other beings in their world. There could be elements of mystery, like a strange disappearance in the pumpkin patch that the main characters have to solve. It could also be a coming - of - age story for one of the pumpkinhead characters, learning about their place in the world and facing challenges along the way.
I'm not sure specifically as I haven't read it. But generally, a graphic novel about 'pumpkinheads' might be related to some kind of autumn or Halloween - themed story, perhaps involving characters made of pumpkins or a place full of pumpkin - like creatures.
Since it's a graphic novel about 'pumpkinheads', the main characters might be a group of friends who are all pumpkin - like in appearance. They could be on a journey to save their pumpkin patch from some kind of threat, such as a group of pests or an evil force that wants to destroy all the pumpkins. And they each have their own distinct personalities, one might be really brave, another could be very smart but a bit timid.
Hard to say for sure. It might be part of a creative concept for a new comic or animation. Maybe the white lightning indicates some kind of energy or special ability the character possesses. Or it could just be a visually striking design without a deep meaning.