Frantz was capable of good work, but his production seems to have been of uneven quality, based on those of his images found on the internet. Examples are in the Gallery below.
An early example: somewhat crudely done, in my opinion.
I like the treatment of light and shade.
This would have worked better in color due to the busy area in the right half. But color illustration was expensive and therefore rare in the 1920s, so black in white this had to be. I wonder if this was a two-page spread illustration because the elements seem to split down the center.
Another vignette-style illustration. These were common in the 1920s and 30s.
An example of his pulp work. The subjects are less-skillfully done than in some of the images above. Either some crudeness was expected by the editor, or else Frantz dashed off the work due to a short deadline or low pay for his effort.
A rare postwar example. Quite different from the previous illustrations, and in line with illustration fashions of the time.