to anyone who wants to get all five endings, here's a little guide (with minimal spoilers) to do so:
1. when you get to the walk scene, ask vasily about elizaveta's gravestone repeatedly. it doesn't matter how you treat him or if you have dreams to get this ending.
2. be apathetic towards vasily and dream of elizaveta. to get this ending, you HAVE to see her portrait that's in your bedroom.
3. be nice to vasily and get close to him, and keep getting dreams of elizaveta. there are two possible ways to get this ending: 1) ask him about the paintings, and 2) don't ask him about the paintings but when you get to breakfast, pick the choice that says you want to romance vasily.
4. be nice to vasily, but if you start getting dreams of elizaveta, start keeping your distance from him. don't ask him about the paintings. when you get to breakfast, pick the choice that says you want things to stay as they are and then pick one of the two final options.
5. be nice to vasily, but if you start getting dreams of elizaveta, start keeping your distance from him. don't ask him about the paintings. when you get to breakfast, pick the choice that says you want things to stay as they are and then pick the option you didn't pick for the fourth ending.
hope this helps!