Hi Mark,
I've taken a look at the file, and agree that Phil has given a pretty good account of what needs doing with it. Anything from that point onwards is down to your own interpretation of the scene - too warm, too cold, etc. It's now all about how you remember the scene.
As you use DPP I opened the RAW there. First impression was the file was underexposed - a killer with the 7d but a few years to late to rectify that now! Still, its a long way from being a disaster, just try and bare in mind that with Canon crop sensor files, exposing 'to the right' really is the way forward. Crop wise, I wold have preferred a little more space at the bottom of the frame, but it was good the focal point was bang on.
So, I increased the exposure, and looked for a good place to try the white balance. Difficult here because there were not many neutral areas but I found the white patch just below the left eye (as we look) gave a good result.
The green background was still overpowering the subject, so I went into the HSL tab (bottom row, 4th from the left, looks like 3 overlapping circles). You have to be careful when messing with greens, sometimes the yellow slider has more effect, but on this occasion I kept it simple and reduced the S slider (saturation) to -2 and the L slider (luminance) to -5. That gave me what I thought were pretty good greens for the background.
I don't normally do too much in the way of sharpening in DPP4, I prefer to do it later just on the main subject, but the file was a little soft.
What I definitely don't want is loads of noise reduction at this point so those sliders were taken down to '0'. The idea there is noise reduction will affect the detail in the hare and I wanted to lose no potential detail there.
As I said, I don't normally add this much sharpening here, but on this occasion I added 4 points of sharpening.
This is the before and after for what I did.
I then took the shot into photoshop and kept it simple here.
I did do a LAB check on the colours which is a fancy way of checking the WB as this is what all the comment have boiled down to. I won't bore you with the details here, but suffice to say, using the WB point I mentioned in DPP was just about perfect, so I'm happy that's got the shot nice and neutral.
Anything else colour wise is down to your personal taste.
I did a couple of curves adjustments which I won't go into here but importantly I thought the right side of the face (as we look) needed to be a little lighter, so please take the shot into PS or Elements, whichever you use, and try this, just to try and learn a little about curves.
Make a curves adjustment layer by clicking on the half black / half white circle at the bottom of the layers panel and choosing 'curves'.
The curves palette will open and you get a histogram, and like others it relates to dark tones on the left, light tones on the right. The diagonal line is what we're playing with here. Click on the middle of the line and drag it up a little until you see the shot going a bit lighter. What you've done here is raise the brightness of the mid-tones which is where you want to target with the face. All the frame has been affected at this point but don't worry.
You're only trying to change a small part of the shot, to I want to invert the layer which, for now, will nullify what you've just done. If you look at the curves layer you will see a white box. This is the fundamental thing to remember with layers and masks, and it is
WHITE REVEALS, BLACK CONCEALS.
Anything white in that box will be visible in your shot, anything black won't be, grey areas are in between.
So, to nullify it like I just mentioned, use the keyboard command 'cmd+I' for a mac or 'ctrl+I' for a PC. This should now turn the white box on the curves layer black and the changes you made will disappear.
You now want to brush in the changes to the specific areas, here the darker side of the face and body. Do this keyboard shortcut - B, then D, then X. This gives you a brush to work with, and by toggling 'X' you can look at the little overlapping boxes towards the bottom of the row of icons on the left of the screen, and you want the white box to be on top, as once again -
WHITE REVEALS, BLACK CONCEALS.
Make sure the brush has a soft edge and paint over the areas you want to alter.
You might want to do more or less to the area at this point, so have a play with the curves box. There will be a little square on the line and just drag this up and down to see how it all works.
Thats just a basic introduction to curves and masking, but if you get that down, it'll all fall into place quickly in the future.
Back to the shot, I just resized it for TP requirements, which is important to do before and noise reduction or sharpening, then did some noise reduction to the background, and sharpened the hare selectively. Let me know if you want specific details on those
Here's the final result, no too dissimilar to Phils, and just a matter of personal taste by now
Hope that helps, anything specific you're not sure about just let me know
Mike