When trying to critique pixelart and sprites, it helps to see them up close. As of now, the only way to do this here is by saving the image to your computer and magnifying them in another program. It's safe to say that this is a pain in the arse.
At many pixel-art related forums there is a function that allows you to double click on images and they are automatically enlarged for easier viewing. To see what I mean, here is an old thread I made on gmpixel:
http://www.gmpixel.com/viewtopic.php?p=8795&highlight=#8795Notice that when you click on the pixel-art, it enlarges. Also, each time you click it and the size increases, there is no loss of quality or JPEGy-ness.
I'm not a coder or programmer, so I have no idea how hard it would be to create and implement something like this, but I think it would be VERY handy to have here.