I like the bold and vibrant yellows and oranges in this sunflower shot. There is also some nice detail in the texture of the petals. I think this is a good shot but has potential to be even better if a few things were done. First is that the center portion of the sunflower that is in the shot needs a bit more light. I am thinking that the petals are backlit to get the lovely colors to shine so either you would need to have a small spotlight (flash)light shining on the center portion of the flower or a small portable reflector to bounce the light onto the the area in shadow. Next is composition. You give your audience a great close-up to see details but in this case it is a little too close. Pull back just a little bit to allow the full sweep of the petals to flow out to the edges of the frame. The leading lines of the petals are cut off on the left and bottom left of the frame - it feels 'interuppted' when I think it would better if it flowed freely to fill that side of the frame.