Hmmm, I suppose "intent" is ambiguous since it covers more than one of these tiers:
1. I didn't notice there was anything different.
2. I noticed, but I didn't cause it.
3. I decided to alter it for a innocent reason.
4. I decided to alter it for a guilty reason.
You probably need a Florida lawyer for a high-certainty answer, but I suspect both 3 and 4 will be a violation.
If it were only 4, then it'd be a bit too easy to evade: "Oh, gee golly officer, I didn't know, I was just following that instasnaptok trend of putting glitter on it to make it pretty. The law doesn't say I can't make it fabulous."
I think you're right about 3 and 4.
I would guess that 2 would also be adequate, and 1 would require a positive defense.
I fear that there's enough ambiguity to hang any disfavored violator, though.