His Wikipedia entry is here, information about his painting technique is here (scroll down), and a website devoted to him is here.
After many years as a commercial illustrator, Harry Anderson largely switched to making large religion-themed paintings for the Seventh-Day Adventist and Church of Jesus Christ of Latter-Day Saints (Mormon) organizations. I focus on his commercial work here.
His illustration style was characterized by smoothly flowing transitions of shapes and colors, though his religious works and some commercial illustrations were more hard-edge. An interesting fact is that he was allergic to oil paints and had to switch to water based alternatives including gouache and casein.
Again, note Anderson's use of highlights on the hair of his three main subjects. The man in the background is washed-out so as not to detract.
His depiction of light and shaded areas is skillful indeed.
The composition is in line with emerging American illustration fashion at that time.
Now for a hard-edge scene: I don't know the source.
Also more in a hard-edge vein. The setting appears to be the Pebble Beach golf links by Carmel, California in the late 1920s.
Finally, Western subject matter. Again, sharper subjects and painterly background.