Hi Robert. That is a beautiful cover, but may I suggest that when it is reduced to avatar size, it will become a small brown blob. I don't think this image will reduce very well. What if...and only a suggestion... you submitted only the 3 from the upper right corner. It's quite beautiful and simple and will be uniquely yours. You could crop the image using what ever software you've got (photoshop?) and save it as a separate file.
I think it would look pretty cool, but of course it is only a suggestion.
for example:
