How do you get past mystic manor in drawn to life the next chapter

If you're talking about the three doors, its a bit of a game of chance.
You have to keep going into that room with the three doors until under the top right door there are two paintings. So basically you'll just keep going through whatever door you want to until the two paintings appear.
When there are two paintings, go in the top right door.
You should come to a drawing area.

First thing you have to do is get to the top firefly jar with a yellow line. Activate the jar and the spikes along the bottom should go down.
This next part can be done in several ways but this is how I did it. Use the two yellow lines, drawing one line next to you and another down near the other jar, a bit to the right so you don't land on it. To get to the jar down the bottom, fall down and then double jump so you don't die. Hit the jar, then go up on the yellow line, and there you go. You'll be at the large colour jar, the end of the level!

Hope this helps~!