I am new to this forum, but I heard that here I can make my Pixel Art better!

Umm... well, I'm not really too good at Pixel Art. I started drawing in the beginning of this year, because I wanted to make a game. And now I actually started making the game.
It is a Sidescroller Metroidvania RPG. But my animations and my sprites needs to get a lot better... they aren't very good.

Well... the main character is called Fear. She's a 15-year-old girl. And here are her sprites:

This is her Idle Sprite!


And this is the Jumping Sprite.


This is her Walking Animation. I... don't feel good about it, actually. It seems that something is missing, but I really can't see what. And in-game it seems natural to me...


And this is a Falling Animation! When the player is falling, this plays!


So... what can I do to make them better?
And soon I'll make a attacking animation for her too, and I'll post it here!

Oh, and... since it's my first time here, I hope we all can get along!