This is a potentially good picture that is spoiled by the dull sky and the lack of sparkle in the field of flowers. If you have Photoshop, here is how I tried to improve it:
Used the magic wand tool to select the sky, and then made a new layer. Then used the "Auto levels" tool on the original to get it more snappy.
Using the new sky layer, used the created a new "Color balance" layer, and adjusted the blue slider till the grey became blue. The added a "Brightness/contrast layer" to brighten the sky up to make it less dark.