if you would start working again here are my 2 cents:
add wrist motion. mozart here plays 3 phrases two phrases with 5 notes and a phrase with 8 notes. before, and between each phrase the wrist should go up and down in a very smooth way, the fingers following.
the beggining of each phrase should be marked by excessive finger motion, i mean: the finger playing first note from the phrase should attack from better height.
remember, that you can raise second finger alone, by itself, but 3rd, 4th and 5th are connected to each other so when you raise 3, 4, or 5th, you need to raise other two a bit.
finger motion attacking a key is not a up down motion. it’s a mini-grab motion with is pre and post motions.
piano players sit generally on the half of the … chair. Don’t ask why.
consider adding after-motions of elbow, but remember
that elbow doesn’t force movement of other limbs, it only tries to follow (in piano playing technique)
just two cents from a piano player :]
ps. as for the left hand: playing this pattern normally would imply rotating motion with an axis on 4th finger , so that the motion of third and first fingers could be smaller. notice that the motion of those two implies that 2nd finger moves also, nearly as much as third. Don’t forget about wrist. it should align smoothly on every attack of the fifth finger, so that there is a straight line between forearm and the left end outline of the hand (more-less), and then smoothly come back to the relaxed position on the 3 attacks of 3rd and thumb.