Just made a sprite sheet, I could use some constructive criticism.

[Jindo5]

I just made this edited sprite sheet of Mario, and sent it in for verifying, however, it was rejected because it "did not meet quality standards for the Custom / Edited section". I wasn't told how it didn't meet these standards, but I was pointed to this forum to ask for some constructive criticism, so that's what I'll do. I've uploaded the sheet as an attatchment, so feel free to check it out.