There is a 10 degree allowance either side for taking pictures, assuming your picture angle is 33, you can go anywhere from 43 to 23. This means that during the first picture (Split 4), you can set your angle to 36.2, which is your finishing angle, take the picture, and start moving right away. This saves you the need to calibrate your angle twice, saving you time.

This may potentially also work for the third picture (Split 11), since the picture angle is 55 and your ending angle is 64.08, however I have not tested this one yet and because of the extremely small margin (0.92 degrees) you would need to be exactly in the right spot in order to save this rotation.

The first skip is a very good way to save a bit of precious milliseconds. The second skip, if possible, could theoretically save up to a second.

Also, some other timesaves I can think of are reversing out of the tunnel before the second fish, to save having to turn around there, and not turning for the final "picture". I've found that the angle for that doesn't actually matter--the monster will always spawn.

A more theoretical timesave is reversing before turning to face the monster during the final picture, since looking forward will stop the invisible wall from spawning and allow you to touch the monster faster once you turn around. I just don't know if it actually saves time, since I don't know if the monster goes forwards faster than the player can move backwards.

Edit: I also think you don't have to look at the map once you take pictures, in order for them to count. The only issue is it can be hard to gauge if the picture actually did count, especially if you take a riskier approach.

Funny enough, there are so few times where reversing the sub is worth it that I haven't actually checked if it's faster.

I am also certain you don't need to actually look at the map, but I think we can all agree that until this game becomes super optimised, it is better to not risk it. The third and forth pictures are ones that I have missed quite often and I lost a good run to that, so it is definitely a good idea to check them for now.

I have confirmed that the 5th picture angle can be skipped. A 64.08 is able to take the picture provided you aren't super out of sync.