This one was especially tough, with each pic being of medal-worthy caliber.
To me, Backyard Shower is hotter. But I find Out of her Shell to be the better picture overall - the setting, the suggested narrative, the props, and last but not least, the incredible model (ridiculously sexy and toned body). Believe it would have been a lock for WCN Photo of the Year if only her eyes were looking up, e.g. at us the viewers.
On the other hand, the glare from the upper right quadrant of Backyard Shower is somewhat of a distraction, and therefore a detraction.
So my vote goes to Out of Her Shell.