Here are the suggested answers to your questions:
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More blank space - Adding more blank space would help to create a visual hierarchy, allowing the viewer's eyes to land on key elements more easily.
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Unity - What is lacking in the logo is unity, as the individual elements do not come together cohesively when combined.
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Bright colors - Bright colors would be most appropriate for a website for a new children's toy, as they tend to attract children's attention and convey a sense of fun.
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Proximity - Proximity can promote unity in a design by suggesting that the elements are organized and related to each other.
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Clip art - Clip art looks more like an illustration than a photo, as it is usually created as a simplified graphic representation.