Hahaha...so much for one's carefully and artistically formulated plans for shooting..and then the best shot of the night is an accident. I've had similar lessons in humility along those lines. While I try my hardest to forget them, I vividly remember one occasion where some random person - who admitted to have never handled a "serious" camera (I.e. anything heavier than a compact) asked to try and handle mine and take a few random shots, just to "feel" it..and of course those 2-3 shots were killer!
But it is the result that counts and in your case - albeit a little small - it seems that a remarkably good picture came out of the whole thing. And at least it was yourself taking the shot, so you get to retain some dignity in your own eyes
It's a really nice picture..good threedimensional composition and a real karaoke-feel to the lighting. Your "models" appears to be very much into it, making it seem as "natural" as I'm sure you experienced it..lol.
...and the good thing about a picture like this, is that it doesn't come with sound..he, he.