Here are a few pages of Jim's Legion of Superheroes art.

Supergirl encounters the Legion of Superheroes.  Detail of the Legion.

The Bizarro Legion.  You HAVE to read this page, and to make it easier, here are;
The top panels.  The middle panels.  The bottom panels. 

A commission of the original 3 legionnaires.

A commission of Saturn Girl, Supergirl and Cosmic Boy.

A commission of Lightning Lad, Sun Boy, Cosmic Boy and Dial H for Hero.