Hold on. Because one random person on one platform reposted your work, you won't even summarize your idea for the comic you want to draw and post for free on the internet?
Here's the thing. Comics get reposted way, way, way more than writing does.
Also, no one's going to sign up to draw for free when you have given next to nothing about the story itself. Not just what it's about, but how long it is, the style you're looking for, etc.