Single post in Questions About Site Rules 2.0

Hello! I know the general rule about sprite usage and all. For example, when using an official sprite from Pokemon games in buttons that's perfectly fine, as credit can simply be put "official sprite (c) Gamefreak / Nintendo" but what is the stance on official sprites touched up by art staff? Such as Unova sprites getting anatomy / shading adjustments? would we need to go through the sprite permission form and wait for an okay, or are we free to use them similar to untouched official sprites? :o I'm using a Unova normal sprite for a button, but it has been edited by staff to have higher quality and I'm just wanting to make sure of things.