This post deals with Pontiac for the 1955, 1956 and 1957 models years, where the brand used the same basic body. In my opinion, the 1955 model was the least attractive, and the facelifts were successive improvements -- though none of the versions was an outstanding design.
The Pontiac version was surprisingly dumpy looking compared to the rest of the GM line. Much of this had to do with its front end. The grille was basically a bar with a few strips of vertical, chromed trim, being integrated to a two-segment front bumper. The headlights featured small "eyebrows," set slightly back, that were faux air intakes. On the hood were Pontiac's at-the-time traditional Silver Streaks; but in the form of two "streaks" rather than a single streak set, as in the past.