I find English difficult to pin down due to his use of several distinctive styles. A few examples are shown below.
But my main purpose here is to present two illustrations for 1963 Buicks done in the style of Bernie Fuchs, who at that time was extremely influential. It's likely that an art director ordered English to "do some like Fuchs." And English, a skilled illustrator still fairly early in his career who had a household to support, did.
Click on images to enlarge.
English's signature is below the yellow flower. It's similar to those in the car ads below.
Automobile Advertising Illustration
His signature is next to the rear tire.
His signature is by the lower left corner. Note the similarity of his treatment of people to Bernie Fuchs' style shown next. Also note how small the people are compared to the car. This reduction of peoples' sizes was common car ad practice since the 1930s and perhaps before, the idea being to make the car seem impressively large.
This shows Fuchs' treatment of people at that time in more detail. Compare to English's Buick illustrations.