Hi Abbi
I wrote a reply but it doesn't look like I posted it so I'll try again - though I can't remember exactly what I said. Basically I think you shouldn't worry about it too much as if your coach is happy, then what you are doing is probably appropriate for the level you are at. It doesn't hurt to know what you are aiming at though. It definitely takes a while to get the hang of the proper rhythm of the jumps that enable them to flow smoothly without being rushed (rushing a jump is never good but there shouldn't be any pauses either).

I wouldn't worry about the back pivot thing right now either as it is probaby more important to get confidence in jumping than in being too technicaly correct at this stage. Basically, whatever you learn in skating you can always improve it somewhere down the line (hence why top skaters still work on crossovers and basics) but if you try to learn it all at once it is just overwhelming.

The pre-rotation is not so much of a problem unless you are doing it in competition (as your friend discovered you can pass level 1 even with pre-rotation). Since the introduction of IJS to replace the old 6.0 scoring system the judges have paid more attention to the grade of execution (how well a jump is done technicaly) even where they are still using 6.0 scoring. So if you plan on ever being competitive then it is something you would need to work on then, as it does make a difference in the scoring.

There is always a little pre-rotation but it certainly should not be obvious and if the whole upper body is already turned then it is definitely obvious

You look like you are doing well for your level though so good luck for your future skating.