If the sunset an flowers are your subject as indicated by the title then what part of this is negative space? Maybe a title of "Horizon" would help guide us to the flowers as the subject of this shot and the neg space is the sunset behind them. Next nice sunset try getting closer to the flowers and give the some light with a flashlight or something and but set your shot up with the same/similiar settings you used here. I think you'd like the effect. And if you use a tripod you'll get a clearer image as well. 5
Fit Challenge Criteria: 1/2
Contast/Color: 2/2
Composotion: 1/2
Photo Quality: 1/2
My Personal Affinity: 0/2
I think your main subject (the flowers) need to be just a bit more prominent. Without the title, most viewers would probably not notice them at all, and would consider the sunset the positive space and subject on this photo. The border really hurs this photo IMO also.