Wasn't sure which challenge I should submit this photo for, since it is backlit and it is food! My original idea for Color Burst was someone blowing Bubble Gum and I tried it, but it didn't work out so well.
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First off, I must tell you I loved your "Food" entry. Right, don't need rocket science, just need good ideas and execution.
Okay, back to the subject at hand. Your kiwi abstract. I like the composition very much. The star shape in the center and the black seeds around it make a lovely pattern. And of course the gradiations of green are lovely.
Unfortunately, even though it is an abstract, usually people like something to be sharp. And it's likely that the overall soft-focus of this image worked against you in this Challenge.
You are doing well after only four Challenges, and I wish you well in future competitions. Welcome aboard.
This looks more yellow than I'd expect a kiwi to be. If you were to sell this as stock I'd think that you'd need to shift the hue to closer match people's expectations.