Watch the Queenie's Waltz online guitar lesson by Adrian Legg from Fingerstyle Revisionist: Adagio Songbook
Let's look at "Queenie's Waltz" in bits. Let's first take a look at Sections A and B as they're nearly the same as each other.
In Section A, there's nothing too crazy going on - the thumb is marking the start of the bar, and there's not actually that much treble picking going on. There's quite a bit of legato, with several of the notes played with hammer-ons and pull-offs. The right hand is very simple, using my middle finger (medio) for a lot of it.
In Section B, we'll repeat the same thing, the difference being that we end up on the tonic, back on the G. And that's it - very, very simple.