Yes you should let them fill the pool. Trowel marks are normal because it's a hand made product. Also, if you still aren't satisfied with the exposure once seeing the water in the pool, the contractor can do another exposure, called a Hot Start. Where acid is added to the pool and a pump (separate from your pool equipment) is strategically located to circulate water. This should remedy most of your exposure issues.

Thank you fillypools,
It looks much better now,and we love the midnight blue. We were afraid how it will turn out bc it was impossible to find one in person. I'll post some pics,through the water changing process, maybe it will help someone in the future.
Don't know how to post multiple pics:(

Greenes blue

Blue but still not clear

Finally:) full sun. Usually it's darker than this

Rainy, cloudy day

Looks so pretty, love the water color very pretty. We have med gray plaster and I love the water color.

Thank you lilsophie, I'm sure yours looks amazing too. We were scared till the last moment, bc everybody sad it will be so dark. Even our pb sad it will be black. But we trusted the pictures and we got exactly what we wanted:)