well done, has made something interesting out of something pretty dull.

Without a High-Res, we really can't see the image properly, what we see here is a down sampled version of what you uploaded, this is why it's important to tick Also save full resolution image. You can still do this, don't even need to upload your image again.
Go to;
My Stuff
my contest entries
find this entry and click on ;
edit entry
tick;
Also save full resolution image.
Your image doesn't need to be enormous, anything between 2.5mg and 3.5mg is plenty big enough.
Good luck