@sdn Yeah it can be tricky! I like your observation that the dog would be looking up at the underside of the shelf. The same principle holds for things that land above the horizon line. We shouldn't be able to see the top side of the baby gate, the desk, the round tv table, since those land above the horizon line and the dog would be looking up at it. If you sit down or lay down on the floor, notice how you can't see the tops of the furniture. It also helps to look at photos or other artwork from a lower perspective.
I'm seeing a few problems.
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Your floor boards don't seem to be going to any vanishing point related to the scene.
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Your furniture is pasted flatly against the walls. They should extend out into the room. The back legs should be pretty flush with the wall and the front legs should extend out onto the floorboards. It can be a little tricky getting the proportions to work right, but it just takes some experimenting.
I've done a quick mockup- I didn't plot it out faithfully, especially the round table, but hopefully you can see how the floor boards would go toward a corresponding vanishing point (the same one the right wall vanishes to) and we aren't seeing the tops of the desk, gate, or tv table. The table and desk legs also extend out into the scene.
