I think an improvement may have been to have captured a 'focal point' in the foreground (somewhere to rest the eyes), for instance a pony, tree or person. You have quite a high ISO for a bright sunny day, being mid day the light is quite harsh.
I bet this view looks even more fantastic in the Autumn, when all the leaves are changing colour!
Your title implies the flowers are the main subject of the photograph, but because of the composition I feel they are almost an accidental capture. I (personally) would like to see the flowers a little more closely, with more details showing. But saying that, I do like the way you have focused on the flowers and captured the background totally out of focus.
This is a really sweet shot, the Sparrow looks quite fluffed up, though I see this was taken in April, so it must have been a cold day! You've caught all its details brilliantly, but its a shame the bird didn't turn and 'smile' for the camera!