Your three pieces on the queue right now are not pixel art, and are not likely to be accepted to the gallery without major changes.
This one isn't pixel art because you've obviously used an auto-aliased brush to paint the colours. An aliased pixel lineart doesn't mean the whole piece is pixel art. Because of the automatic colours (and the automatic resizing in the thumbnail version), your palette is thrashed with wasted colours, and the whole thing looks blurry because automatic AA at these sizes is almost always looks overdone.
Your other two don't use any non-pixel art tools, but because of the scribbled lines, they're in the realm of oekaki rather than pixel art.
In pixel art, every pixel matters. In these three pieces, the pixel placement was only deliberate for the linework. For everything else, the pixel placement is haphazard, and if even a lot of the pixels were changed, it wouldn't make much of a difference - a telltale sign that a work is not pixel art.
If you're interested in learning to make pixel art, I recommend starting with this tutorial, which explains what pixel art is and what it is not, how to approach creating it, and common mistakes to avoid.
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Your three pieces on the queue right now are not pixel art, and are not likely to be accepted to the gallery without major changes.
This one isn't pixel art because you've obviously used an auto-aliased brush to paint the colours. An aliased pixel lineart doesn't mean the whole piece is pixel art. Because of the automatic colours (and the automatic resizing in the thumbnail version), your palette is thrashed with wasted colours, and the whole thing looks blurry because automatic AA at these sizes is almost always looks overdone.
Your other two don't use any non-pixel art tools, but because of the scribbled lines, they're in the realm of oekaki rather than pixel art.
In pixel art, every pixel matters. In these three pieces, the pixel placement was only deliberate for the linework. For everything else, the pixel placement is haphazard, and if even a lot of the pixels were changed, it wouldn't make much of a difference - a telltale sign that a work is not pixel art.
If you're interested in learning to make pixel art, I recommend starting with this tutorial, which explains what pixel art is and what it is not, how to approach creating it, and common mistakes to avoid.