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. When they come out to do the chemical start up, another plaster guy said to have them do an "acid stack" where they put the muriatic acid in a steel tube right on some of the more blue spots. Hopefully it will help. He said to do another acid wash in 2-3 years and it will help.