RATS!! - I wrote a long response and lost it!! I'll try again but quickly this time.
Very nice - very readable and singable except for the following:
Generally speaking, FFF and louder is reserved for ensembles. I don't know if there is a hard and fast rule about this, but I am a Baritone soloist and when I see FF, I give it my all.
I know a few very very good sopranos that might have a few words with you

when they see a low C at measure 11 to be sung FF, not to mention a low B at M. 19, same dynamic!
I might recommend that you scale down and compress the entire dynamic range of the peice - at the very least for the vocalist. I.e. ffff = ff, f = mf or mp, etc.
Also I would probably try to reduce the size and get it onto four pages so there are less page turns.