These are absolutely adorable! You've captured his personality so well in your fantastic, energetic, but very comfortably casual-looking style. I especially love that mischievous expression at the bottom, and the pose with the guitar. Very reminiscent of the Mickey they need to bring back and keep around. <3
Isn't that weird? The old pie-eyed Mickey showed blackface roots in his pink lips and white eyes... and then with a simple change of the eye design, he went from blackface to whiteface. Now he looks like a black mouse wearing a Caucasian face mask. Amazingly prescient on Disney's part; if he hadn't done that, Mickey would probably have had to be retired just as Bosko and Foxy before him.
I actually like the slightly more mouse-shaped ears you gave him. The circular ears are way too abstract in my opinion-- but I think you already made that point in an earlier picture, about his not being mouselike in any respect other than name.