PhilAreGo happened upon this brochure for the Santa Fe Railway, and offered the following interpretation os the scenario depicted on the cover.
Wow! Get a load of them eyebrows! The two guys look like they're hoping to get her alone for some wicked doings, but she looks downright carnivorous herself. The standing man looks like he's dropping something into the drink of the seated man. All the while, the lady is staring at the chest of the pill-dropping man, where she knows that mere inches away, beats his juicy, delicious heart. I find it hard to have any sympathy for whatever happens to these three in the next few hours.
Phil then shows what the illustration would look like by retouching the eyebrows, making them lighter and then even heavier.