Hi, I have noticed two things in your animation:
1. The green body grows and shrinks while walking. Instead, it should bounce like the head.
2. The left leg is in front while the left arm is in front, too. (and vice versa) You should do it "crossed", like putting the right arm in front when the left leg is in front.
Here's an edit to show you the difference:
old / new
But it still looks a bit like the sprite is skating. I only know how to fix this in a 8-frame animation. So I added 2 additional frames and changed the leg positioning a bit to push the bouncing a bit more. (This is only a quick edit, arms and legs are a bit wacky, but you should see how this would work, I guess)
'hope you like it
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