This is something, that I believe, would be a bit better to Draw it First on Grafik Paper and Scan, what you now see and Zoom it in to see, how can the Sprite can be Big or Smaller/how to do Pixels!
First what you Outside the Draw to see, is the Analyse how Big the High, length and legs, and Arms are compared to each site!
Sure, I can use Draw for the Game Instead of Pixelart, however you see, that must be much better and Clean up, etc.
So I Change it maybe to Pixelart and it is not the only Reason!