I note that some folks are counting the blue as other spacial objects. I would caution slow going with that.
I use my 50x optical zoom on my camera to take shots of objects at night. One technique I use to expand the objects I can see in photos, is to bring more light to the photos.
I can multiply the light by thousands of times. This works very well, improving on a photo that may at first only reveal six objects, but when the light is multiplied there can be upwards of 30 objects.
There is a point where I cannot push the light up any farther, because I start getting anomalies. Those anomalies are generally blue. I’m not sure why, but that spectrum seems to be prominent.
This photo may have been pushed just over the limit, and those blue objects may be anomalies. If they were truly objects, we should see them as we see what we think to be the moon that is shown. They could be smaller, but they should still show up brighter if they were truly revealed in this photo.
There are supposed to be 4 smaller ‘moonlets’ besides Charon, orbiting Pluto. It’s probably them.....................