Hi,
Nice animation! I really like your character

. However I do think it looks a bit stif right now. In walk cycles it's important to have the entire body move in the rithm of the steps. So the shoulders should move with the arms and the body should hop up and down with the legs. I've made a quick edit to show what I mean:

Also a little thing to notice is that when you walk you will never have your right arm in front of you at the same time your right foot steps forward. When your right hand is al the way to the front, your right foot is all the way to the back.