Improved Fresnel Term

My instructor, Joe Kniss sent me an email telling me that things are looking better but that he's not seeing enough sky reflected in the sphere and to check my Fresnel term.

It turns out that I didn't have reflections turned on, which is done via a command line flag. Nor were shadows turned on. Here's the new render:
Click on the image for a larger version.

I've changed the specular highlight to an orangish-red, but I'm not really liking it. Also, the clouds have disappeared. Yuck.

[EDIT]

The clouds have disappeared because of my lame attempt at soft shadows. I was using multiple point light sources to approximate an area light source, but the shadow it created was ugly and the clouds disappeared. No soft shadows for me.