That gives the image more impact, the whole thing looks sharper and clearer.
I may have to get those books that you recommended in your journal though I already have dozens. I have three different ones just on Photoshop and haven't looked at any of them yet.
A lot depends on how your monitor is set up. I tend to make my images a bit on the dark side so I have the brightness of my monitor turned down to compensate for it, when it looks right on my computer I know it will look slightly brighter on most other peoples monitors.