Your technique is very good! I don’t have many suggestions. I couldn’t see your bow hold very well, but when I did it looked like your thumb was straight (It is hard to see from that angle whether it was or not). Try keeping it bent, that will help you connect the bow into the string better. I thought your instruction was good! It would make more sense to someone looking at the sheet music. On the shift, I would recommend using the 2nd finger as your guide note, rather than the 1st finger. Instead of going down the the one, just shift the 2 up to a B.
Good job! Thanks for posting!