In my persistent perfectionism, I've come to the conclusion that I could have done the first line with a bit more upbeat energy than I ended up giving it. Though the given delivery would work better for one of the later repetitions of the line, I feel I could have demonstrated more emotional variance here. I may record another take, if that would be helpful in rendering a final casting decision.
The first time should be a little more upbeat, yes, and the second time he says the line should be a little more melancholy. If you feel that you could do a better performance, feel free to try again. :)