Mark, as other have said, you have created some nice themes to develop further. If you want to evoke the feeling of children, you certainly want the orchestration to be light and lively. Your initial circus march theme is a touch plodding right now...sounds like walking elephants, not children. But that could be fixed with a more elaborate orchestration. What does the arabian-sounding central section intended to evoke? Careful with that, the "arabian" sound could feel a bit hackneyed.
J