Ok, I uploaded again, and I searched the weekly checkbox but I did not find this. So I pressed the submit button again.
Note that the challenge calls for a sprite which means the entire body of a character or item.
Here you have a portrait of a sprite.
You can leave this as it is to add to your gallery but not the challenge.
You understood that it can't be in the challenge because its not a sprite, right?
It can be in your gallery as pixelart, that's cool.