It’s not the perspective is off exactly. The proportions are off. Probably the easiest way to tackle this is to look for some reference images from a similar camera angle. You won’t be able to find anything with a door in that exact position in relationship to a twin bed, but what you will find if you try to find or take this sort of image in real life is that the foot of the bed will be fairly wide, and the bed will be very foreshortened.
Because the bed is really really long in what you drew, the room and everything else comes out feeling off.
You also have the eye line level with your horizon line. That’s not automatically a problem but you have the horizon set about at the midpoint of the window on the far edge, and if you extend things back the viewer probably has their eyes around 7-8 feet up. Not inherently a problem but it makes the room proportions not come out plausible for a person who is standing in the room because their head is banging on the ceiling or the room is very tall.
I usually find it’s easier to make up an image like this by starting from reference. Probably not photos, go to ikea or just draw your bedroom. Get a feel for how reality works. Then take a favorite tv show or movie with a bedroom set and try to fill in the blanks. A 2D floor plan will be easier to draw, but you can try widening the field of view from stills too. Stills that include people will be easier than stills without, because you have a better sense of how people work and they give you a proportion check.
Basically, making up a shot like this that depends on perspective from whole cloth is a bloody nightmare. And doing it in a very rigid architectural rendering style like this makes it harder.
https://www.lizsteel.com/sketching-street-scenes-without-persepctive/ Might help. Also while the tutorials themselves are very app dependent, sculptingman over at the Procreate app forums has a pretty long sequence of perspective tutorials from an architect POV that are very helpful.
https://procreate.art/discussions/10/28/23197 Is one, if you find it helpful the rest are linked here
https://procreate.art/discussions/10/28/25367 . The reason I say they’re app dependent is a lot of drawing software doesn’t have a way to lock in proportions while you’re using transform or warp tools, or it might not be easy to find. But the logic part, including using custom brushes to dodge annoying bits, applies in any app.
The last thing I can think of is it’s really enlightening to try setting up a drawing that uses your full field of view. Cameras can’t really do what our eyes do, at all. Try not to get hung up on a rigid perspective in a full field of view drawing. It’ll be a bit wonky because we don’t really look at things flat.
