Most of the painting is the glory of God all around. The very small Church in the background signifies our very small, very limited understanding of God.
In this scenario, Gattie Gator is being (possibly) coned or scammed into buying something from a smiling salesman. While her aquaphobic brother (hence the innertube) is about to be a snack for some furocious creatures. Will Gattie be save her bro in time? Or is he doomed to be a disasterous dinner special?