Yea, I am having problems fine tuning it. Some links to larger pics work, others dont. And it wont recognize the last 3 for some reason. I am still working on it.
Don't know about Publisher, but from MS Picture Manager, go to Picture > Resize. A side bar will pop up asking foer a new size. I find that if you make the short edge about 400 pixels high, you're at a reasonable size that everyone will quickly load.