Edit:
The sword moves a lot, but the character does not at all. I don't know if you have ever seen someone swing a sword but they don't just move the sword, their whole body moves. Also, what is he hitting? his slash doesn't hit anything in front of him. He's now just hitting the grass.
The best advice i can give you is to just search for reference material, look at games you want to imitate or animation and try to recreat those. Something ilke a tutorial for "general pixel creating" doesnt exist. pixel art is still just drawing/painting so you gotta learn the fundamentals like perspective. There are however, tutorials for pixel-specific techniques like anti-alias and outlines.
To add a gif or image, upload it on imgur, then right-click and copy the adress of the image, then click on the mona lisa image in pixelation.org to add an image and paste the address between the [img]. sometimes imgur does weird and gives you a link that starts with blob. and is very long, just refresh the imgur page and try again.