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Welcome to the forum!
It's looking good. You seem to keep the bow mostly straight, can't tell if it's actually parallell to the bridge as it's not filmed from an angle where we're looking straight at the side of the violin but I get the impression that it's good. And in 3 days! Have you been doing your practice infront of a mirror?
Howdy, welcome to the forum.
You're doing excellently for 3 days in. Using the entire bow, slow, steady strokes with good tone. I thought at first you were moving your upper arm when you shouldn't have been, but I watched it again, and that was only when you were near the frog, when you have to move it. There was a slight amount of movement sometimes after the upper arm had straigtened out, so you might want to be aware of that, but it was very minor.
About the only real change I'd suggest is making your right wrist looser and more flexible. When it's near the frog, it should be bent down pretty noticeably. This will tilt the bow hair to one side, but that's actually desirable - your hand acts as if it weighs more when you're playing close to the frog. Using less hair compensates for that some.
At the other end, you want the bow hair to be flat (or near flat) on the string, which will require your wrist to be cocked up some. (How much depends on how long your arms are, and how much you play the violin to the left vs how much towards the front.)
You're doing that now (and it's a nice smooth transition, as it should be), it just needs to be somewhat more extensive. Right now, the wrist is up a little bit at the tip and down a little bit at the frog. That's the correct motion, just exaggerate it.
One request on camera angle. Turn yourself about 15-20 degrees to your right, so that we're seeing the violin at right angles and right in line with the bow. That will make it the easiest to tell if there are things like the bow moving up and down the strings, tilted, etc.
You made me work to find something to suggest, just so you'll know. 🙂