I think I'll go crazy if I think about every possible way. Which example best adheres to standard notation practice?
#4 is most correct. The LH stems should be up instead of down. If space between systems is tight, #5 is the second best alternative for the LH only. The only correct RH is #4.
The reasons why for every choice is readability. Brief clef and octave changes are much harder to read. Keeping the right hand on the upper staff and left hand on the lower staff is easier to read.
Note that for the passage depicted, sempre legato is redundant. If this is the beginning of a longer piece that will not have slurs and pedal marks throughout, then the sempre legato makes more sense.
Definitely buy Elaine Gould’s book Behind Bars which has explanations of all of these options and so much more. It is the authoritative reference on standard notation.
None of these examples are incorrect, an experienced pianist should be able to read all of them, but some of them could be improved:
- a downward stem on the first low F# would be better. The sixteenth rest should probably be nearer the lower stave.
- the beams on the sixteenth notes (particularly the second quarter) could be a bit more slanted
- the LH stems should all point up