I've just uploaded a new version of my RedBubble art manager application (this is v22.214.171.124). You can get it from here.
The main change in this release is to enhance the "promote a work" dialog as per Julie Langford's suggestion. Whereas before it simply let you promote with a simple image it now lets you promote with a simple image or one of the various product previews:
The result of something like that being:
Another change is that I've added a command that takes you directly to a work's edit page on RedBubble, something I thought of after reading a comment made by Shelley Heath.