You always open up a photo to editing when you ask for PP help don't you.
My steps were (I won't post up the resultant photo unless you ask for the example)
1) Add an adjustment layer for levels. Adjust the white point (right most point) back until I get the highlights at a level I am mostly happy with. Adjust the shadows (blacks, left most) to a point where I am happy with the shadows.Then I adjust the mid-point to a point where I am happy with the overall look of the photo.
2) Add an adjustment layer for curves. Change the curve to get the look I want, this is best done by having the original un-edited image next to you at times for reference. Curves is such a wonderful tool and really does allow you to concentrate on certain aspects, just try and keep them smooth in transitions.
3) Add an adjustment layer for color balance. Here you can bring out (or take out) the colours you do or don't want.
The first photo needs a bit of all of them, it was underexposed more so than the second one, nothing unusual about that though with a Nikon D70 family
Adjusting the levels to get the right base feel will make it really come out. Fine tuning with curves will allow you to bring out certain parts of the photo and allow it to pop. The slight green cast to the photo comes out alot when the levels and curves are adjusted, but a small tweak was done in color balance to put a better tone to it (from my perspective).
The second is much better exposed. Some fine tuning here is required and it will come up great as well.
The first photo I really like, this shows the reckless abandonment of children. The second really is a moment shot, I can see she was in the process of telling you something, I just can't see what it was
All in all looks like a nice lens to add to your collection.