Lots of good comments and observations already so I'll pretty much leave it at that.
I found myself wondering what, exactly, "He" was doing or not doing. I thought you could have put several lines in there describing somewhat of his behavior that lead her to that place and time. Just a thought for the future because I know you're not going to go back and rewrite a verse just for this.
It's okay to wonder that, but the song is not about "what He was doing....".
(He's not abusing her.)
It is about a love that has faded and her reaction to that. Here are "clues"...
"but his love's grown cold....she can't understand"
"...they gave her no rules for when love slips away"
"...hoping he'll love her again"
"she's tried to bring back the romance"
"how could they let what they had slip right thru their hands"
If you spend "several lines" focusing the song in a different direction, you end up with an unfocused song. And probably too many verses and too long to keep your listener's attention.
The kinds of things that require rewrites to remove.
So, I doubt I will be doing that in the future, either...
The guitar at the beginning is off to a good start.... (talking about your live one) Not what I'd call a signature lick, but certainly a really appropriate intro fill. I tend to use fills a lot. Someone mentioned Bob Segar's Main Street.... Yes, now that's a superb example of a signature lick, it starts the song and shows up throughout the song. Toward the end it starts to variate a bit but keeps the overall feel and tone regardless. Wonderful Tonight is another great classic signature lick that plays throughout the song by Clapton.
On the lead in your song, as the song rolled on, however, I found the lead to be a bit distracting as it played behind the other tracks in a few places. It wasn't in too many places so it's not a big deal. It was more like a meandering series of notes relying on the FX for it's dramatic effect. The easy solution is to mute it in the balance of the song. However, I do think that a proper, nicely crafted signature lick for this song would really set it off nicely. Signature licks tend to be pretty simple melodic riffs that will fit well in numerous places in the song and gives it a musical cohesion apart from the lyrics or anything else.
This was not intended to be a "signature lick", but in fact, a sound (or FX as you noted) "...for it's dramatic effect" (as you also noted). The "signature" part of the production is the overall feel which has been noted by others. I understand your penchant for we-only-put-fills-in-the-holes production. But productions have evolved dramatically in the last 15 years (especially Country). Here is just one example (you will find similar "behind the other tracks" leads in a number of places throughout the song) :
https://www.youtube.com/watch?v=nN1jZaZbBhw
As always, I'm picking out the really small details because everything else on this song is so well crafted.
Well done my friend.
Thanks for the spin. And the thoughts.