I have never seen
Iphigeneia before but I'm thinking "ih-FIH-jee-NAY-uh". I don't like the name - it's overly complicated (imagine learning to spell that!) and I don't think it's useable in real life.
Ismene is pretty though, and not very different from more usual names like
Esme or
Isla. I'm saying "IZ-meen" but I don't know if thats right.