That's funny, I also just put my 50th arrangement in submissions.
I think those might have to be that way, given that it's a sixteenth and a half note, but maybe an updater can help out here. I'm not sure about those myself.
Right; still looks a little funky, but given that it's what I hear in the song, it's going to stay that way. Fixed.
Both of these look fine to me.
- to substitute for the triangle, I have inserted some arpeggios in the LH here and there, but I feel like m. 13 could be something that sounds better
Em seems like a strange choice to me given the previous harmony. I'd probably go with something Bm instead (i.e. change the G to an F#.) Also that way it gives a V -> I movement.
Onto my feedback:
-RH of bar 13 the second semiquaver in the group of four should be a B not an A. Same goes for bar 21.
-LH of bar 11 the top note in each set sounds like a B rather than an A.
-LH of bar 19 and 23 is the sixth quaver a B rather than a C? It's kind of hard to tell since the notes aren't tuned nicely.
-The way the slur and tie are interacting in bar 8 looks a bit odd. I'd move the slur down a bit.
-The rest in bar 21 looks a bit funny at the moment. I'm not normally an advocate of hiding rests ... but it's a possibility. If you don't hide it I'd move it up a little since at the moment it's kind of half way between the staves.
Nice work.