Those are "Eastern" tentacles with an almost Vanillaware shading style.
Regarding the message that is hidden (or not, I don't know). But in case it is: "Left arm of lighter girl is fused into her ass, skipping elbow and hand." Off course it should have been mentioned in the flag reason. And since this message will disappear, I want to make it public for eternity >:3. And my statement is that the flag reason per se is not really valid, but regarding these flaws, I won't re-approve this.