Pretty sure that's not Arc.
Her eyes are red when not pissed off.
That said, I'm not sure who it is.

It's an illustration contributed by Takeuchi to a "Kyoto in Spring" themed artbook being released at C77. It's not any actual character, as far as we know.

maybe it's saber, she's got blonde hair and green eyes right?

spazfire777 said:
maybe it's saber, she's got blonde hair and green eyes right?

do you see green eyes on this one? besides, saber's hair is a tad longer than this one

Dark Saber has yellow eyes. But you won't see her walking around like that.

takamachi said:
do you see green eyes on this one? besides, saber's hair is a tad longer than this one

flannan said:
Dark Saber has yellow eyes. But you won't see her walking around like that.

Maybe it's an older variation or something, i dunno

Lol Takeuchi Sameface Syndrome. But I don't think it's necessarily supposed to be anyone from the Nasuverse, though the ahoge suggests it might be some sort of AU Dark Saber.

Saber has a Ahoge. This woman clearly doesn't exhibit any ahoge hence this can't be Saber

I see a really really really really really really small ahoge so there is one but nowhere near Saber levels.

Location based on Takase River / Kiyamachi
compare: https://goo.gl/maps/eHskB