Ah, yeah.
Construction is complex, it also deals with perspectives.
Looking at the 2nd sprite it's in two different perspectives at once.
The torso is facing us (foreshortened), from the waist down it faces sideways, but unless it's supposed to be an f'd-up Silent Hill creature that isn't gonna work. (Also arms proportions are wonky there, and too much extra space around the sprite, you might want to cut down on it)
Made a quick GIF:

You see?
This next part's general tips, also motivation:
Serious, take those
PDFs.
Copy, rip the knowledge in them apart, leaving sprites and original stuff mostly out of the picture when you start for more gain.
Then bring it back in, applying what you know.
You could be on your way to being a spartan pixel/artist by the end of the book.
Hope it helps.