I tried making the Knight from hollow knight and failed miserably. I still haven’t finished, I will make improvements later one and finish it. Reference I used:
the shapes arent well defined, the cape is over detailed compared to the rest, however i think the biggest improvement you can make here is your colors, see in the image the light is tintet a magenta/purple and the shadows on him arent as harsh, try learning a bit more about pixelart shading and hue shifting, if you are able to apply those it will improve the artwork dramatically
here are some learning resources:
Pixel Joint Forum: The Pixel Art Tutorial
Pixel Joint Forum: COLORING “I dont get it”
i look foward to seeing your art improving 
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Thanks, I will make sure to follow the resources!