Thank you all for the helpful advice!
As Asti said the door isn't in perspective, and the windowsill isn't either.
The TV-stand and speakers(?) are completely flat, which doesn't help the depth any.
Mostly though, I don't think perspective practice really works at resolutions this small (or pixel art in general).
I agree on the door, and now that I look at it, the windowsill would be viewed straight on, instead of at a downward angle.
I have heard the argument that I should be practicing with pen and paper (and I do, just not as much as with pixel, as that is my preferred art style.)
I would disagree that you cannot practice and get things down through pixel art, as all the fundamentals of art seem to still apply. No disrespect, you seem far more versed than I.