Nice one

Very nice GL

Some white balance correction and increased contrast would greatly improve this image.
I also suggest you take your camera off auto, an ISO of 3200 gives a lot of noise. You would have got the same exposure with ISO 400 and exposure time of 1/80 sec. You will get much better quality photos if you could try keeping your ISO at 100. This isn't always possible of course, but is good to aim for.

great shot but I'm pretty sure
'Shoot just one and only one colored object against a white object.'
Means that the 'one coloured' means the object has only one colour.

It does not say one color, it says one colored object.

The true intent may be misleading.... due to the contest picture..... one item of multiple colors will be accepted. but ONLY ONE ITEM.

This is what the rules state: one item of multiple colors will be accepted.