I see improvement, though what I think would help most would be using references. Or maybe even a base once and a while to help you grow into making stuff like that. You'll eventually get the hang of it and be able to grow off of the references/bases. Also, with the running. Try making the limbs reach out more, try studying the reference I gave you and copy it frame by frame just to get a feel for it, you'll soon be able to figure out how to do it without a reference.

Do you can write in the coment Q&A