- To get nitpicky with grammar for a moment: In the tempo marking, since "eighth note" is a symbol, the plural should be made with an apostrophe before the s.
- The tempo should be 123 BPM specifically. Also, the number in your tempo marking is bolded for some reason.
- I think the measure distribution would look better with 4 measures per system and the last system ending halfway across the page. However, I know some people prefer not to shorten the last system, so this is up to you.
- On m8 LH Layer 2 beat 3, there's a low F where you have a rest in the triplet, if you wanted to add that or not. (The F plays in the triplet twice in a row). Same goes for m26.
- In the second half of m8, you should use the note mover tool to manually move the swung eighth notes in the RH and LH to be aligned with the last note in the LH triplets.
- You can hide the Layer 2 half rest and flip Layer 1 down for m9/13 beats 1-2.
- For m9/13 beat 4, write RH Layer 1 as eighths instead of a triplet, and manually adjust the second eighth note with the note mover tool to be aligned with the last note of the Layer 2 triplet. Align the eighth note in the LH the same way.
- In m12, I think it would just be easiest to flip the Layer 1 half note on beat 3 downward and flip the Layer 2 eighth notes up. Even if it makes Layer 2 seem a little discontinuous, it looks a lot cleaner and is still very clear to read.
- In m15 LH, you might consider changing the G's in Layer 1 to Bb's in order to preserve the 7th chord feel there. You might also consider doing the same in m21-22 as well. m19 is also another possible place to add the 7th (C) on top, though not as necessary as m15/m21-22 IMO. (Alternatively, for m21, you could change the dyads from Eb-G to G-Bb.)
- On m18 LH beat 3, it's impossible to hold the A as a quarter note and play it staccato as an eighth note at the same time, so I would remove the overlapping A from Layer 1 and just leave it as the quarter note in Layer 2.
- There are thirds under the whistling melody from m17-22. (There are also thirds under the Layer 2 eighth notes in m16, although those may be a bit harder to play.)
- The last eighth note in m21 LH Layer 2 should be a G instead of a C.
- For m26 LH, you can hide the Layer 2 half rest and flip Layer 1 down for beats 1-2.