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The R arm and hand seem secure and correct (perhaps the hand is a bit stiff), and the bow is nicely at right-angle to the string (although too close to the fingerboard). Remember to pay attention to all the very basics (like stance), even if more "advanced" techniques (like bowing, here) seem unproblematic at the moment: sooner or later, a difficulty is likely to arise, and the longer the bad habit has been forming, the longer it will take to correct it.