Fair Use is an exception to copyright laws that allows you to use a copyrighted image to make a point. For example the Mickey ears are very much a Disney copyrighted icon, however if lets say a televised newscast was running a story on something Disney they might put up a graphic with a Disney Mickey head logo to help illustrate the company they are talking about. They wouldn't need permission to use it since they are using it as a reference to talk about Disney.
With that being said most people stay away from using the exact proportions of the Mickey logo, this seems to be one of the things Disney pays a little more attention to. if you put something else in the D I think you would be fine.
Looks good though.