#3
I don't think a lead would really add to a sombre style of piece like this.
#6
acoustic only songs almost always sound flat without the vocals over it. so its hard to give
much criticism without the vocals, if you do have them you could tab them with like a flute or chior ahhs or something. other than that, nothing really screams unique. but like i said it could be completely different with vocals
#8
yes imo.

you can still put the lyrics in gpro by pressing t and put them over each note if you really wanted to.