First of all, I really think that Tim Russ has a wonderful singing voice for an actor. Either you can sing or you can act, there are very few that can pull off both.
It's interesting to think how the Drayans can pull off their agin process. Too bad they don't go deeper into that at some point in any of the series. Who knows, maybe there will be a Star Trek: Delta Quadrant Missions series or something (hahaha... genius I am not..)
Tuvok is usually portrayed as a cold Vulcan, and I suppose for the most part that he is, but here we see that he does care for his children, and misses his family, and that he is a wonderful father. He spent time singing to his children, playing music for them if they couldn't sleep.
I wish there were more episodes that allowed for character developement like this one. They're always so few and far between.