Hi Silvio,
all I did was use a bit of Gaussian Blur to lessen the sharpening effect, got rid of the noise around the butterfly and then darkened it slightly.
- Used dodge and burn tool to lighten and darken specific areas.
- Used Un-Sharp Mask to bring out more detail.
- I reduced the noise from the BG (there's no noise in the original, but after sharpening there was some).
- I added a frame too.