Most of the images you're using are actually copyrighted, so they should not be submitted to User Content. Avoid relying on Google Images to find clipart. Search for "public domain clipart," "royalty clipart," or "creative commons clipart" -- one of those or some combination thereof is likely to lead you to images where copyright isn't an issue.
Also, "borrowing" others' submitted content is not allowed. Please refrain from it.
That said, you're making good color choices and are going in generally the right direction. With the right clipart (or better yet, original art!) you'll be making quality flags in no time
