What about a sharingan but with the two tomoe instead larger, stylised and poking out of the eye's edges? maybe also have the red part glowing?
I'm a big fan of having the final hurricane seal included somewhere, like in darkgamer's banner.
I wouldn't count on it remaining at two all that much longer.
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So I'm going to go ahead and say that while we shouldn't underestimate Temari, we also shouldn't
overestimate her and spend far more effort on that battle than is entirely necessary.
Hisana is so much faster than her that this match wouldn't take more than a second if she went all out. Even without the Lightning Blood seal, she should just be able to cut her fan in half before Temari can do much of anything. Which would also rather conveniently cripple her for the invasion as well.
Because while Temari does become a Jounin fairly young, you shouldn't forget that that's three years off, and that Temari is older than the Konoha rookies. She didn't do anything in her match with Shikamaru that Hisana couldn't do better- she used a lot of wind jutsu, but it was always rather weak. It couldn't even cut trees down.
While you can say 'she managed to throw wind jutsu for hours', you can also say 'she managed to throw wind jutsu for hours and not even cut down some small trees'.
Her 'flight' is also less that and more floating- and there's no real reason to believe she can do it for a long time. Hisana's Raven jutsu seems outright superior.
It's possible that she has her summon at this point- but I think it more likely that she got it specifically because she realized that if she had more firepower she would have won that fight with Shikamaru.
And if she
does, well, speed difference again. She'd only manage to cut her finger and draw a symbol on her fan if Hisana let her.
So then you have to ask- what's more impressive? Ending the fight as quickly and efficiently as possible, or playing with your opponent and giving them time to surprise you? Because you can say it's to show off intelligence and planning all you want, but if you're capable of ending the fight quickly and painlessly, and don't, that doesn't strike me as all that intelligent.
Besides that, she should be using the absolute minimum effort possible on a relatively unimportant exhibition match- don't forget the invasion is happening right after, and that Hisana is already nearly guaranteed a promotion.
That said, I do think using the Lightning Blood is entirely unnecessary for already stated reasons. The fight would be effectively identical either way, one just reveals a trump card.
[x] No, you need the surprise!