When you are looking at tuition advertising, many people opt for a pic of their studio. It’s their pride and joy and the place where everything happens. However when users are looking for classes, they aren’t really interested in where they will sit. It’s more about who you are as a teacher, and the kind of things you teach. So a picture of you, doing your art, in your studio is probably the ace card!
Whatever image you use, make sure it is in focus, that the colour is not dark and dull and that there is no messy backgrounds. People view these images on their phones ie teeny tiny screen. So the less clutter, the better!