Initial impression: Very Impressionistic, reminds me of Monet.
Technical: As it's both quite macro and abstract, not strong in terms of traditional composition. However, did you finished very well so can't ignore that. Looks like you did just enough post-processing to help the image pop. My screen tends to show noise and I am really not seeing any here. Wouldn't change any of your camera settings, they work together beautifully for this shot.
Artistic: Sunflowers make great subjects, they're huge and colourful. (Think my Golden entry from yonks ago, of a sunflower, was one of my first 5s...or close to being so!)I like that you used such a long exposure to get this shot. It really does look like it could be flames.
Overall: Lovely vivid image with lots of movement apparent. Very glad you finished as well as you did. Good work, keep it up!