The most common Hidden Mickey is a formation of three circles that may be perceived as the silhouette of the head and ears of Mickey Mouse, often referred to by Disney aficionados as a Classic Mickey.
Thank you so much for stopping by with your question! I'm very happy to report that you're more than welcome to use your smartphone or personal camera to take pictures with the characters at the Walt Disney World Resort. In fact, I do it all the time!
Personal Use versus Commercial UseSo yes, I can make my daughter a Donald Duck shirt for a birthday gift. If I were to accept any sort of monetary payment or reimbursement for these gifts, that is when it would then be considered commercial use. Disney could then come after me for copyright infringement.