That's awesome, i've never noticed that before. It's kinda like the resturant in Mexico in the world showcase at Epcot
(There was a smoke from the volcano that shows a hidden mickey just briefly. it is in the resturant in Mexico at Epcot)
If im not mistaken, there are also a couple more hidden mickeys: One of the treasure stuff you get from defeating an enimey is a mouse statue and if you look at it, it looks alot like mickey mouse. There is another thing (Cant remember where) that is also in the shape of a hidden mickey. Might get screenshots of both and post it here or the gallery.
Still, that's an awesome find