Hey Hannah,
First off I think your technique looks pretty decent you've got a nice sound base to work from. That said, I'd just make a couple of points:
I agree with earlier commenters about the pushaway, it's a little high, the only reason I would suggest lowering it is that if you ever need to speed up, at the moment you have nowhere to go (well, I suppose you could go higher, but not easily). It's possible that with the slightly late timing you have you're having to pushaway higher to increase ball speed. I would recommend lowering your ball to your waist and pushing away a shade earlier but this kind of thing is important to do under the watch of a good coach, changing timing can be fraught with problems if not done correctly.
The second (and I think more important) thing, is balance. Your finishing position at the foul line is a little off balance, probably because your trailing leg is directly behind you, I'd try and get this a little more to the left if you can and focus on holding that position at the line, also getting your non-bowling arm out a little more to your left too will provide a bit of counter-weight to the ball on the other side.
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Reporting from England