What's Up with my Sprites?!

[TheRulerOfOats]

Okay, so, I made a series of sprites for a character from a favourite obscure game series of mine (Wonderland), and that character was named Stinky (An example screenshot of what he looks like is marked 'Reference'). The sprites were designed to look like a mystery mushroom costume from Super Mario Maker. The sprite sheet marked 'Original' is the sheet that I first submitted about a week ago. The sheet got declined, so I messaged the member of the team who declined it what was wrong. He quickly, and rather kindly, responded that the colour palette did not fit the rest of the mystery mushrooms, and implying that this was the only issue with it. He also implied that any future concerns over a rejection should be posted to the forums, and I also agreed with that. In fact, I agreed with everything he said to me. A friend over Twitter analyzed the features of the Mario Maker Mystery Mushroom colour palette, and found that the colours were muted and had far less shading to them than the sprites I'd made. They were also kind enough to re-do the palette for me to fit with the Mario Maker style, and so then I applied that palette to the sprites, creating the sheet marked 'Revision 1'. I resubmitted the sheet, only to find a PM today from a different moderator telling me it still wasn't good enough! I took the previous advice of going to the forums into consideration, and here we are now. So, what is the issue with my sprites, guys?

P.S. The stale walking animation is a reference to how he walks in-game, and I also mentioned this when submitting the 'Original' sheet, and the moderator confirmed that the rejection had nothing to do with the animations.

P.P.S. If the image below isn't visible, imgur has probably deleted it from their servers, and by that point I imagine this topic will no longer be relevant.