What does it mean "requires revision"? What do I supposed to do with it?

Two of my pixel art works were declined with the following: 'Pieces must exhibit intentional pixel placement over the entire image. Scribbles, unrefined drawings, careless "spray tool" effects, uncorrected color reductions, uncontrolled anti-aliasing, etc, will be denied entry into the gallery. Note that it is possible to have intentionally messy pixel placement and such cases may be allowed into the gallery.'

I confirm, that every pixel it that works is placed intentionally and all the antialiasing is done by hand. What do I have to do in order to get these works approved?

One of them is my avatar I would like to use on PixelJoint forum, by the way.