Advice on my Rejected Sheet?

[striker212]

I've recently made a custom sprite sheet for a Super Mario World Goomba. The first time I submitted it, it got rejected for being "not up to quality standards". I thought it was because the icon had a white background rather than a transparent one, so I changed the icon and tried again. However, my sheet was rejected once again for the same reason. Can any of you help me pass the standards and get my sheet accepted?

   

[Simpsons Dumper]

Did you ever hear from anyone about further details on reason for rejection?

[striker212]

Did you ever hear from anyone about further details on reason for rejection?

No I haven't, only that I should "go to the forums" for help and feedback.

[Simpsons Dumper]

Welp, that's not very helpful. Maybe not enough frames? Was this the automated message or from further discussion with the rejecter?