Another important factor is what color profile you use. Be sure you save the jpgs as either SRGB or Adobe RGB, not ProPhoto. Most browsers don't know what to do with Prophoto, and end up messing it up.
That said, I can see the rocks in the orginal #2 on my monitor, but they don't have a lot of color to them. I'm guessing the version you like is somewhere between what your original and Rocky's revised version look like on my screen. Great photos!