Tanuki is correct.

However, not only is this not pixel art, but it lacks any real effort in general. Check out the work in progress section of the forum to learn from fellow pixel artists to improve your work.

Sending it back for revision due to NPA.

I don't believe that this fits the definition of pixel art for a couple of reasons. We call something pixel art because it's art that was made at a pixel level, with each pixel being purposely placed. Most pixels are individually placed, one by one, except when doing something like using a fill tool to fill in an entire shape.

What you have here is something we would call oekaki, rather than pixel art, because the outline looks like it was made by being drawn in one stroke for large portions of it, instead of the pixels being carefully or individually placed. In oekaki there's no need to zoom in to do something like that, but pixel art can't be made without zooming in closer. Also, the highlights look like they were made by an airbrush tool, or some sort of paintbrush that had anti-aliasing on it. Pixel art puts a high degree of emphasis on control, down to a pixel level, so we consider any tool or technique that alters pixels or adds colors in a way that the artist does not have control over each pixel that's altered or each color that's added to be a non-pixel art tool or technique. You also have 727 colors here, including a large number of partially transparent ones. In pixel art we also highly emphasize using a limited number of colors. Preferably as few as possible to make something. There's no exact limit to the number of colors, but anywhere from 8-64 is probably the most common color range. It's very uncommon to see more than 100 colors used, usually only in large or especially detailed pieces.

You can read more about the basics of pixel art here.