Hmm, now don't hate me, but I have assumed another avatar and might not be loyal. Or fair. Or friendly.
This banner...Hmm...Who are they supposed to be? I know those are Gryffindor students, for I can see their ties and colours, but you must be very specific in doing these things. People want models to identify with the characters. Are these Hermione and Harry? If so, where is Ron?
I am going to say this from the deepest core of my heart - you need to be specific. You need to be canon-wise. You need to leave no doubt that what people are seeing are what they should be seeing, and nothing more, nor less.
Hope this helped.