I agree with the 800 px width and the 100 Kb max. size. I usually use Photoshop to crop/light my pics and then save it using the "save for web" function. The pic about was not edited, it was 1600 x 1200
800 px width is enough to appreciate details without making the page too heavy, specially for old PCs or slow conections.
Tim, it's Bronco's Stag III; I build it for a friend
Darío