Non-profit sea turtle programme needs simple turtle design

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This customer received 67 illustration designs from 21 designers. They chose this illustration design from rum as the winning design.
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Illustration Design Brief
We need a very simple design that depicts the 3 species of sea turtles we have nesting and foraging around our islands (leatherback, green and hawksbill). I love the free flowing brush stroke designs by Weiss Art Australia - simple and not nessesarily "complete" but animals are clearly recognisable. The non-profit has a logo but this will be used specifically to represent and promote this particular programme. I've attached a design that was given to us but it is WAY too busy although it shows the differences between the species. Colours for each turtle should be limited to greens (green turtle on the right in the image), browns/golds for the hawksbill (on the left) and greys/black for the leatherback (middle).
Target Market(s)
conservationists, tourists & local community
Industry/Entity Type
Environment
Colors
Colors selected by the customer to be used in the logo design:
Look and feel
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Colorful
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Upmarket
Requirements
Must have
- 3 different species of sea turtles (leatherback, green, hawksbill) that are recognisable but VERY simple. Doesn't have to be the complete turtle as the design may become too "busy".
- Leatherback is the largest with at least one ridge running from the neck to tail, the hawksbill is the smallest and may have a more jagged edge than the green turtle.
Nice to have
- Free flowing brush strokes of different widths (not just a single uniform line)
Should not have
- No more than the 3 turtles, all should be recognisable as a specific species and not as generic turtle shape.