This was still early in McWilliams' career. As he moved into the 50s his skills improved rapidly. I feel Twin Earths was his first mature work. Like most Raymond-influenced artists he wasn't one for dynamic posing. Superheroes were definitely not his bag. However he was good not only at machinery, but also figures, clothing, backgrounds, and natural effects like water (he drew great oceans). In the early days of Warren he poured everything he had into a short story about a doctor who accuses a woman horticulturist of being a vampire. It was a beautiful job. In general, whether early or late in his career, if a script called for a a guy jumping onto the ladder of a moving fire truck, McWilliams would draw a guy jumping onto the ladder of a moving fire truck-- not a closeup of two hands clutching a ladder rung. That's why I find this job disappointing.