That's a very nice photo. I like how the flower stands all by itself, and above everything else in the photograph. It seems to exhibit a kind of quiet dignity simply because of its isolation.
Thank you and I agree with your comment, to be honest about the (f-stop) I'm not sure that is because I lost the exif information of image, since this is the only one I have which is compressed and I was able to tell you about the focal approach was, but now I believe only in a back-up