Well... Here's my effort...   Nice n simple..
PSD available of course...
 

Okai, here's my attempt. BTW this is my first post; hi everyone.

For the flower I added a layer of white and set the mode to soft light. I fiddled with the opacity until it felt right. The white was actually and off-white, more like a minor tint of cream.

I admit the leaves are a bit off in terms of colour and I haven't kept the edges perfect. I think the problem with your image is the contrast between the leaves and flowers. Although the leaves are a lot nicer looking, it actually distracts from the focus of the image, this being the flower.

By using duller colours for the leaves and bringing the flower out with the brightness I have drawn the eye to the flower more smoothly.

I also use another trick in photoshop. Go to image - mode - 32 bit and then switch back to either 16 or 8 bit. This will open up a HDR conversion box. Switch to local adaption and adjust the curves. (This will allow you to adjust colours, contrast and brightness but with much more flexability than the contrast option in the image - adjustments menu.

I also used unsharp mask after flattening all the layers and using Amount:75, Radius:25 and leave the threshold at 0.

I edited your image using the techniques I talked about before. Here is the result. Hope you don't mind me stealing your image as a colour template. To get better results, do the edits on the desaturated image then colour it.