You always want to get into the habit of exposing properly and getting the shot as good as you can in-camera. I repeat always get the cleanest and best image you can in-camera. That said adding a tiny bit of contrast in post processing software can help add a bit of punch to your images.
[attachment=1:34dcvmgj]reshopot lesson 1 004 critiqued.JPG[/attachment:34dcvmgj]
This is the original:
[attachment=0:34dcvmgj]reshopot lesson 1 004.JPG[/attachment:34dcvmgj]
One thing that you will notice is the subtle implied curve in this image. That’s great!