Learning Something New with Seeing Is Believing

I know I can be dense about some things, and visual description is certainly one of them. It's always a struggle for me to add such things because I don't learn about my character's hair or eye color until it comes up, until the moment their hair does something to bring it into my vision, or they look at something or someone with emotion reflecting the color. I have, at times, considered this a benefit because I let people image the characters as they see fit. However, this theory breaks down when the image is undermined as that information becomes relevant, long after the reader has made their own image.

Why am I going on about this, you ask? It's very simple. I'm 46k into Seeing Is Believing, either about a half or a third depending on how long it ends up, and I just discovered the MC's love interest's hair color. They were out in the playground and her hair blew about in the wind, reaching out to tickle his face. And so I saw it, the hair, for the first time. Oops. Now what? Well, in the scene, the color was irrelevant, so I left it out. However, I went to the characters page of my spreadsheet and put under her physical notes that her hair is black...oh, and that she's about half a head shorter than he is. The only other note I had there was that she had brown eyes.

And when I did that little note taking, a light bulb went off above my head. It's simple really. So I take these notes while I'm writing, but when I do the first edit pass, all I have to do is go back to the first couple of mentions of the character and tuck in those little details. I won't have to know them when I first start writing the story, and the reader need never know that I didn't figure it out until 46k into the novel. Seems perfectly simple to me now, and I even may have done that with previous edits, but this time I made a conscious decision/plan to do it. My process is catching up to my workarounds and they're making sense :).

Here are the current stats, but they don't quite reflect the truth so I've added explanations:
New Words: 3385 words (On a marathon and was behind in the week anyway :). This does not include the 112 words to add a new scene to the outline.)
42 scenes (This number is incorrect because a large number (not sure how large) of the scenes don't exist in the outline yet.)
33 complete - 79% of the novel (Same issue as above.)
9 Scenes remain (I have at least 11 scenes in the notes that are not in the outline, and probably need at least that many more still.)
12584 Remaining word count (Based on current (truncated) outline)
58724 Estimated length - with an average of 1398 words per scene. (Length based on current outline)
46140 Current Total

At some point I really need to finish this outline ;).