For more detail go to the link and click on the image for a high definition image. You can then move the magnifying glass cursor then click to zoom in and click again to zoom out. When zoomed in you can scan by moving the side bars on the bottom and right side of the image.
This link will let one simulate how bright it is on Pluto at Pluto’s “High Noon” from where one lives.
https://solarsystem.nasa.gov/planets/dwarf-planets/pluto/plutotime/
So is the blue stuff ice?
If you zoom in on the image you’ll see redish-brown deposits. I wonder what that is.