well, basically, if you use a high contract filter when it is not needed, your whites come out way to bright / bleached looking, or your blacks lose a lot of detail.
Why were you holding the filter up? Put it in the top thingy...but anyways, the 5 filter looks like you got a pretty good exposure on this...so i reccomend just burning that bottom bit without a filter.
i would def burn that bottom left corner in, but when you do that what will probably happen is the top right corner, because it is so white, will be the first spot that the eye notices on the print, when you really want the flower to be noticed first. You might want to see if you can pull some information in there also.