Here's a way to have some fun with an AI art generator. Pick an action scene paragraph from your writing, and then write a description of the main character in the paragraph. Then go here: 

huggingface.co/spaces/jbilcke-hf/ai-comic-factory

and paste your paragraph into the 'story' field and your character description into the 'style' field and click Go. You probably won't get exactly what you see in your mind, but it is fun anyway. I think you may get 2 or 3 free attempts, and if you set up a free Hugging Face account, apparently you get unlimited attempts. 

I am not sure I am using the app correctly, so experiment on your own. Have fun!