You have the concept down here and the legs are done pretty well. I think your improvement here would be with some perspective and form. To make the back leg feel correct it needs to be off of the plane of the from foot otherwise it comes across as being completely crossed over. Adding some Tlines will help you add depth and form to the boots as the leg enters them.There should be a gap or a form line giving depth to the top of the boots. I hope this helps and gives you some things to work on.

