WIP Alex and Joy: "You are cheating!"

the title says everything what will go on in this pic. 

2 additional characters can appear here: on the right side on a treadmill (mirrored) and on the left side walking in or out, face towards us. Any recommendations? the character should be somewhat sporty or athletic (e.g. i could place Sam on the treadmill). If you have own characters with these attributes, they could also be shown. This is still WIP, this might change, the camera angle might change, and so on....I am plaing with the idea if i can place a mirror or turn the camera the way that we can see who`s doing the photo....