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Even if it's not perfectly fluid, the animation is kinda good.
From what I can eyeball, you have 4 frames, but frame 2 and 4 are identical; it'd be more fluid if you made different frames, and on one of those have the character lift his front leg.
Also, the head shouldn't tilt horizontally like that. Your character is likely to stare right in front of him while he walk.
Hope that helps!