When you upload a thumbnail or image to PMC, if it's low resolution, it gets blurry. Because this is a website for the sole purpose of pixel art, I think it would be nice if images under 64x64 would be pixelated, instead of blurred. This would make it so people don't have to upscale their images before uploading.
You can change an image to be pixelated instead of blurry by using this css:

img {   image-rendering:pixelated; }