The short answer ......... there is no rule as to border size.
In fact, you do not even have to have a border if you want.
You have a lovely quilt here .. .and to me, a log cabin quilt, sometimes just reads as "do not border me!" IMHO this is one that cold finish up the way it is.
However, I am wondering if this is not your quilt as you mentioned a red small border and then a navy one ... and yet on my computer screen I only see browns/beiges.