Natural is always better when it comes to eyebrows. However, it may come across as too thick. This is where you have to do a little spring cleaning. I personally prefer thick bold eyebrows. Every once in a while I trim them a little and sometimes I pluck them thin but I always come back to thick. In some cases where eyebrows can look like bushes and if that's the case, refer to my Shape it up post.
The bottom brows may be colored in and plucked to groom but still look good as a natural brow.