Like Quiara has said, the arm movement is very good, and I like the slight head bobbing as well. The legs don't quite look like they are running though. Maybe an in-between frame between the leg hitting the ground in front and moving to the back could help, if that makes sense. And as Hapiel said when running there are points where both feet are in the air so maybe a frame for that too.

Nice work!
Another part that is important to a run cycle is that the legs actually lift up from the ground, there are moments when both are in the air. The body goes up and down too.

Good luck!

So the movement on the arms looks really good and bouncy and dynamic, but it doesn't look like the legs are moving back and forth so much as the light's hitting one and then the other.