Great job!

One thing to work on that may save you a ton of grief down the road.  Watch the video and see how you are using your shoulder to move the bow with a relatively stiff elbow and wrist.

On just open strings first, and then on twinkle or whatever, try keeping the shoulder still and moving the bow by opening and closing your elbow and keeping the bow straight by compensating for the arm angle with your wrist.

This is coming from experience, if you develop the habit of bowing with your shoulder, it takes a huge amount of effort later to learn to do it right.

The reason this is important is because, as you will notice in your video, when you bow from the shoulder, the bow does not stay perpendicular to the strings and this results in degraded tone.  You may not notice the difference now, but in the coming months you will.

You are off to a fantastic start!

joe