Regarding the art: This is the unupgraded card art. I imagine the upgraded art will be shiny like all the others.
As for Stone Skin, the card does two things: Increases maximum HP by X (amount of
), and heals for X. So with SoS (awesome coincidentally fitting acronym), it would increase maximum HP by X and damage you for X. Same goes for Shard of Divinity.
At least, I assume that's how it's coded. Otherwise, it could potentially lower maximum health by X.