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Always think "cute". The food designs should be cute and appealing to the eye, as well as the accompanying serving dishes. Ways to help achieve this include:
Using small shapes and small portions.
Using cute colors. Pastels or very bright colors can be cute when properly matched.
Using faces and happy expressions.
Keeping the designs "fun". Fun motifs help to make the food "cute"; think such fun things as monsters with smiles, winking hearts, baby creatures with huge eyes, grinning hamsters, etc., as designs.
Match the designs for size. While keeping everything small, evenly matched sizing can help create an overall cuteness.