I'm liking most of these c:
For King Reptile, I don't really think the outfit feels like something a king would wear, feels more like an outfit for an highly skilled fighter, but there are so many kind of kings, so who knows?
Goro Kahn seems like a good entry, but not my favorite. Most of the skin got a nicely done shading, while the armor parts got low contrast, and in some parts, no shading at all. And Goro got a small head, how come the eyes are appearing in a place that Goro's eyes can't even reach? It really looks like he got his head stretched in this one. I'll be honest, feels like there was lack of attention in this entry.
Sindel was the one I voted for, as I love the creativity on it relating it to the age of Onaga. The dragon marking on her body and everything, it really feels like she was like that at the age of Onaga. It's really awesome and creative. On criticism, the only thing that bugs me are her feet, looks like there's only two fingers in there.
The Scorpion entry seems to go for a more original style of pixel art compared to the other entries I've seen yet. It seems to make a perfect use of a limited palette for the whole scene, and blends nicely in almost everything in the pic. The cliff details are not that much of realistic, though, could have been done better.