For artists who have problems with perspective (furniture etc.) in indoor scenes like me - there’s an online programm called roomsketcher where you can design a house/roon and snap pictures of it using different perspectives.

It’s got an almost endless range of furniture, doors, windows, stairs etc and is easy to use. In addition to that, you don’t have to install anything and if you create an account (which is free) you can save and return to your houses.

Examples (all done by me):

Here’s an example for how you can use it