Are you concerned about the colours while editing or the colours as it's posted here.
I downloaded the file to see what I could do and found it to be much nicer in my offline viewer/editor.
For starters, when exporting your images for the web be sure to use sRGB as the colour profile. I don't know how to set that in your image tool but in Lightroom it is an option on export. Most web browsers don't read embedded colour profiles and as a result can't display the image they way you produced it. sRGB is becoming the standard and web browsers get it.
Here is a small sample of the colour differences from your shot to your shot in sRGB...
You should see greater colour depth and more contrast on the right. This is without editing.