Creative Martial Arts Tshirt Design

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This customer received 19 t-shirt designs from 8 designers. They chose this t-shirt design from Fatboy Graphic as the winning design.
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T-shirt Design Brief
Looking for a tshirt design that captures the spirit of determination but also looks cool - something kids would want to wear to school.
I'm thinking a boy version and a girl version - perhaps a high kick in the air.
I want the background to incorporate the colors of belt that the students in our karate school earn, maybe in a linear progression or abstractly represented. (White-Yellow-Orange-Blue-Green-Purple-Brown-Black) I would also like the kanji for "heart" (kokoro) to be included or incorporated somehow.
I like the sumi-e style and think it would look very cool done this way, but am open to other ideas as well.
The figure needs to be a young boy/girl, looking between the ages of 7 and 10 years old.
Industry/Entity Type
School
Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.
Elegant
Bold
Playful
Serious
Traditional
Modern
Personable
Professional
Feminine
Masculine
Colorful
Conservative
Economical
Upmarket
Requirements
Must have
- boy and girl versions
Nice to have
- belt colors incorporated
- kanji for heart
Should not have
- blood or violence