Your link goes to the submission/edit page, so it doesn't work for people other than you.

I went through your gallery. The piece is NPA, and that is most likely why it was not accepted. The last frame(s) where there's a grey scribble, the scribble looks like NPA, it looks like you used the Line tool with anti-aliasing on or the Brush tool, or rotated the existing lines (with auto AA), instead of using PA techniques.
I can't see the full version now that it's been sent back, but I also think I recall seeing some distortions in the pixels from where it was scaled up automatically, also a no-no.