I think this needs a lot of work. It doesn't really have any sense of weight or fluidity to it. There is so much shifting around from frame to frame. If you're in animation school, you really need to start paying attention to the little details and step up your game. Like, look how the foot nearer us wobbles all around. I don't mean to be a downer, but if you're going to school for animation I assume you want to get good at it. And to get good at it you need to pay attention to the details and look at everything you do with a very critical eye.
You say you want to give it more weight, and this is really the fundamental challenge of animation. How to imply the weight and movement of an object. Your walk now lacks weight because it lacks contrast in the movements. By this I mean, clear changes in the shape of the object. Right now it's just a blobby shape that slides back and forth. If you want the walk to have weight, you need to demonstrate that weight somehow. In a walk, this is often achieved by showing a contrast in the shape of the leg; one frame it is extended onto the ground, the next it is bent and the body is over it. This is the sort of contrast I mean, showing how a shape changes over time.
One more thing, it might be helpful to approach animation more holistically. By that I mean, don't just do the legs and leave the rest for later. Everything has to move together to make sense, especially for an object as complex as the human body. Try starting with a simple stick figure. When you can clearly see the weight in it's movement, then start adding the volumes.