In the meantime, I finally finished the one-point perspective assignment. Drawing things in perspective aligned with the perspective lines is relatively simple by now. However I cant figure out how to draw things in correct perspective that are aligned at an angle to the perspective llines (eg the chair at the back). How do you guys do it? Do you crate another vanishing point? Do you just wing it?
Also here is my reference photo. My goal was to give it a 19th/20th century vibe. Like the home of a noble adventurer, a member of the Travellers club.