Well, thanks indeed for your generous comment and listening. (In fact it's been in my mind to write a concertino for soprano and ensemble!)
Ah, the string portamentos? An effect in this kind of music I like and try not to overdo it. The strings have an enormous variety of timbre.
There's a note just under the header on the first page about an asterisk * under a slur meaning change the note portamento.
Cheers!