Your left hand position looks fabulous! Have you tried vibrato yet? Your left hand looks like you would be ready to start learning it. You are doing a great job keeping your bow wrist relaxed. I would recommend trying to hold your bow slightly different. Try to keep your pinky bent and try not to wrap your pointer finger around the bow so much. Check out Itzhak Perlman’s video on bow grip. I think it is very helpful. Let me know if you have questions. You can find me on the community page and I am also available for lessons here.
Great work! Keep it up!