Based solely on what we can see in the image and the summoner icon currently on the PBE, AB Riven's color scheme resembles another one of Riven's skins.
The two skins look very different in their own ways, but from what we can see currently at a glance, they look too similar, in my own opinion. I suggest shifting AB Riven's colors to be more white and silver than various shades of blue with blonde hair, if only for the sake of defining the difference between the two skins a bit better.
Granted, I'll buy it (and the icon that goes with it) no matter what colors it has, but the skin will be received much better if it doesn't look like a CS Riven 2.0, but maybe thats just me.
Thats my suggestion anyway.