As much as anyone can tell from a photo, the soil in the right hand plant looks very dense for juniper. The soil in the pot on the left looks to be better draining and gritter. Junipers don't really like wet feet.
If you're watering both trees the same, the one on the right has probably gotten too much, as it the pot is much larger (which holds a greater volume of soil that takes longer to dry) and the soil looks to be on the heavier side on the organic components (which makes it hold even more water).
Unfortunately, the tree is mostly likely dead. Once you get that "off" looking green and brown patches, the end has either already come, or is in the immediate future.
If the foliage crumbles when you touch it (even if it looks green) it's a goner.
When it goes, I'd pull the plant out of the soil and have a look at the root mass. I'd bet the interior is staying pretty wet.