Ships that pass in the night
Both by Sidney Sime. [Golden Age Comic Book Stories]
Artist Unknown [Golden Age Comic Book Stories labels the image as "Egg," but I don't know who that is. It doesn't really look like Edward M. Eggleston's stuff. Anyone know?]
What's that noise?
By Gil Elvgren. [Golden Age Comic Book Stories]
Creature from the Black Lagoon
By Francesco Francavilla.