I've used Saucenao and Google reverse search but it only showed me the Reddit post as the source, I recalled seeing one of their artworks reposted by another user on Tumblr where their Tumblr account was said to be deactivated (or it could be another artist that I'm misremembering). Either way, if anyone could find the artist and source, that would be appreciated, thanks.

favorited because it's cool guro that just so happens to involve school shooters

Dont like it? click off. its easy, but they cant follow that simple rule lol