Profile image does not display in my Twitter Widget

I've had no problem with my background or profile image on Twitter itself.
However, my Twitter Widget does not display my profile avatar.

I have helped embed these for some other users, and theirs display properly while mine does not. My profile avatar does not show up on the preview when creating the widget, nor on live sites once embedded.

My profile image is in JPG format. I've tried viewing it on both Macs and Windows computers with both Firefox and Safari and my profile avatar does not show up on my Twitter Widget. I have also gone back and looked at my friends' Twitter Widgets that I had helped to embed and theirs still display properly.

???

You can see for yourself here:
http://blog.blue-green-marble.org