For details on Hopper's career, here is his Wikipedia entry. It seems that Hopper worked as an illustrator at first in order to make a living doing art. But as Paul Giambarba in his blog "100 Years of Illustration" suggested, Hopper really didn't seem to enjoy that line of work. Nevertheless, he kept at it into his 40s until he was able to fully transition to fine arts painting and engraving.
Many painters in this occasional "In the Beginning" series of posts made extreme changes in style from their early days to their days of fame. Hopper was not one of them. His illustrations were influenced by the needs of art directors, so we can't give them much weight when evaluating the early Hopper. But his non-landscape paintings definitely prefigure his mature style. Mostly they lack the later refinement and clarity.
One of Hopper's better known paintings to set the scene.
Two scenes from his Paris days.
He later painted many such interior scenes featuring young women in isolation.
This hints at later streetscapes.
One of his nondescript illustrations.
I'm not sure what to make of this because it is so atypical.
Hopper spent time in Maine and did some landscapes. His later, famous landscapes include structures such as houses and lighthouses.
More illustration work. He had to keep at it well into the 1920s.