Well, first of all, you may or may not notice red lines crossing your body and/or weapons (depending on how you've used them) when you charge for a flourish attack.
Secondly, [spoiler]after you've made all choices and the battle is upon you you'll gain wings representing either good or evil, depending on those choices[/spoiler]. From that point on, when you charge a flourish, the [spoiler]wings[/spoiler] will appear along with the glowing red lines.
[SIZE="4"]"And on the third hand..."[/size]
[SIZE="2"](Quick! Get an octopus!)[/size]