Lovely girl! Nice pictures.
There are positives and negatives to both:
Soft image:
+ The background is more blurry - useful if you want to simulate a narrower depth of field than what your camera lens is capable of
+ With a backlit shot like this, you get a more ethereal or ghostly effect which would be destroyed by sharpening it.
- The model is less detailed - see eyes and fingers
Sharp image:
+ Model very nicely detailed
- Background sharp too.
One experiment you can try is take the soft image and sharpen just the eyes. Most human beings when looking at people are drawn to eyes first and then to other bits of the body (unless of course we are talking about Pamela Anderson

).
So just sharpening the eyes might do the trick.
The other possibility is to select the whole girl and do a very mild sharpening and then do a further sharpening of the eyes.
But this what I like about photography - its an art more than a science. Beauty is in the eye of the beholder. What could appeal to you may not appeal to me. Keep shooting - your work is good! Good choice of models too