your acid wash on the pebble looks a bit uneven. I'm seeing some streaks where there's more blue. I've got some splotch in my pool too. Maybe it's just difficult to avoid patches of darker pebbles in close proximity?
I also noticed that my pool was much bluer on first fill up. But then after brushing and time, some of the blue plaster probably washed away leaving more or the rock, so the pool is not a blue anymore.
Yeah, not too happy. They didn't do the acid wash as good as I liked.