About the setting, it is not the most reliable picture of the history (16th century) and there's a lot of overlooked issues or how things are in that time period where the anime choose to take place. It was delivered so lightly, doesn't give the "how things are from that time" rather it is in a "fantasy" viewpoint, so it is acceptable. But about the story line of the protagonist itself, it gives a classic tale of a noble wanting to break free on their own. It's a good anime without the thrill or anticipation to turn for what next will happen, rather a good fantacy drama.
About Arte's hardship and the relationship she established along with other characters like Leo, Angelo, Veronica and soon how she was impressed by Yuri. But there's little development or beneficial transition of the characters hand in hand to Arte. Example of her way to Venice, where there Katarina plays a part for Arte (development), but it was so light almost like for sake of 8th episode to have something to look forward whether Arte will come back to Leo and continue as an apprentice or to stay to Venice. But leaves a gap almost imbalace to her supposedly choices since her relationship with Yuri or Katarina was rather little sudden or hurried.
But I like the ceiling painting. It was a memorable accomplishment for all of them. And the scene where Arte's mother show up. It's a nice story nonetheless to watch.