Basically from what I can see, you began with the lower horizontal lines and then your 'inner lines' were the upper horizontal lines.
Because they are higher they appear to be physically above your first lines. This gives the impression of them being closer to the viewer. Hence due to the perspective they have become the 'outside' instead of the 'inside'
Note: When I say 'higher' it's a complex statement because we're talking about lines on a flat plane but essentially the new line is connected by a straight line to the lowest part of the box. So our brain automatically says that one is higher than the other, unless you are making an Escher style box that's how geometry works. So it looks higher up to the viewer.
If you want to avoid this a good rule of thumb to follow is the interior lines will be behind or below your exterior/border lines.
It still looks like a box though, your halfway there! So good work! Perspective gets to the best of us, do some life drawing it may help!
Bloo-Ink in the post "Why does box A look like box C after drawing the inner edges (box B)?"
2022-03-15 18:57
Basically from what I can see, you began with the lower horizontal lines and then your 'inner lines' were the upper horizontal lines.
Because they are higher they appear to be physically above your first lines. This gives the impression of them being closer to the viewer. Hence due to the perspective they have become the 'outside' instead of the 'inside'
Note: When I say 'higher' it's a complex statement because we're talking about lines on a flat plane but essentially the new line is connected by a straight line to the lowest part of the box. So our brain automatically says that one is higher than the other, unless you are making an Escher style box that's how geometry works. So it looks higher up to the viewer.
If you want to avoid this a good rule of thumb to follow is the interior lines will be behind or below your exterior/border lines.
It still looks like a box though, your halfway there! So good work! Perspective gets to the best of us, do some life drawing it may help!