Also there's no need to submit a new peice, simply update the older one, k.
Go to your gallery and click "edit icon details".
The preview is ok, the main image is still 10 colors (same image as before?).
You don't need a 'detail file' anyway as the image is less than 100x100.
Also you could (and still can) have edited the previous upload, no need to resubmit.
It's good form to post the reference image, if you used one.