sorry if this is a stupid question, but I'm wearing a professional suit in the selfie I'm planning on using. It is also pretty close-up, so the committee should be able to see my face clearly.
Although the 2x2 is mainly for identifying you during your interview and to put a face behind an application, sending Adcoms a flattering "selfie" may not be the most mature thing to do when applying to professional schools.
Unless you can see your arm holding the camera or take it from an odd angle, I would say it's pretty difficult to determine if a picture is a selfie or not.
Mine were selfies. The program I cropped them with made the appropriate size 2x2 photos, but also literally quadrupled the photos and placed them in a 2x2 arrangement.