Everything has to be designed. EVERYTHING.
Here’s an attic sketch. It starts with a quick google sketch and then picking some elements of an attic I think will quickly distil the essence so we can see it’s an attic from multiple views. It also needs to break a couple of rules (gotta be taller to fit in what I need to fit in). Then you play a game of “how many things can I think of that will fit in here” (and you amaze yourself with how limited your imagination is). Try it!
Attic: boxes. Big bags filled with stuff. Old mirror. Bird cage. Rolled up carpet. Stacked newspapers of a specific date. Brush. Light bulb hanging from ceiling (which means you need to figure out where the electric is coming from, so probably visible cable of light bulb tracing down to either a wall socket (unlikely) or a cable trailing behind a bolstered wall), a entrance (is it a side entrance? unlikely, from below? probably, trap door like thing) more boxes and er… oh god..
And then you try and not draw all of that stuff because the story isn’t about that (unless there’s a specific prop you’ll need later)