.jpg found on Newgrounds version of Friday Night Funkin'

[aoe]

I found an image in the GitHub files for Friday Nght Funkin, and I'm pretty sure they can be seen on the Newgrounds version of Friday Night Funkin. So I tried to submit them but they were rejected and I was told that it "wasn't in the game or appeared to be fan art". I think it was called "skin-funkin-cardboardtoast.jpg", so I want to know if I should try submitting it again or if I should just look for a different file to try and submit.

(also i did already convert it to .png)