Hi @Shane_Wu, welcome to Wick!
Since I have access to Mediafire, I’ll upload it here for them:
This is Shane_Wu’s wick file (59.6 KB)
It’s impressive how much time you’ve spend on this animation
I recommend adding more vibrations since the horse is moving forwards, and make the character lean more forwards to control the horse.
You can also add objects in the background and make them move horizontally to help show the horse running direction, along with some dust and make the tail fly more (if the horse is moving quickly).
If you want it to walk slowly rather than run, then you should slow down the leg movement and look up a horse walk cycle to use. Online references are always helpful!
I also recommend watching Alan Becker’s 12 principles of animation, they helped me a lot!