What exactly is Pixel Art?
Pixel Art is a discipline by which images are created with pixel-level intent or precision. It is more than an end product - It is a methodology focusing on techniques such as hand drawn dithering, anti-aliasing, shading, animation, geometry, and some color theory. Here on this forum, people develop these skills and in turn teach them to others.
When you post work that focuses on these methods, you will receive useful feedback that will help you to improve. While there's no static law that says something IS or IS NOT Pixel Art, some works can certainly be more in line with what is discussed here. For example, Oekaki, a web based drawing phenomenon, does not consistently represent the methods. Also, just because a game uses a sprite, that does not immediately qualify it as pixel art since some games have been known to convert 3D rendered models into sprite stills. Posting works like this is not encouraged.
Members at this forum are interested in many subjects and artistic mediums, and we do offer places on the forum more appropriate for the posting of non-pixel work. If you're posting reference images for pixel work, this is an exceptional case. Blatant disregard for the purposes of the forum will not be tolerated.