Upload & Sell: On
"I'll see if I can figure the working space profile embedding out. I assume it's going to be a setting available when I save for web."
Yes, there's a checkbox in SFW in include your profile, which should be sRGB for online viewing.
I forgot to add, that in the version I made, because of your super bright background, that background itself becomes a secondary light source, which in this case, is perfect. It looks like a nice, well controlled kicker light coming in from the left. Unfortunately, if you had lit yourself with a much darker background, that important kicker, and it is important to the feel of the image, would be all but missing, so you would have to add that in with a third light, mimicking what you see now.