I like to link description to action and to character reaction. Here's an example from a WiP
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Jule stepped through the doorway and paused, unsettled. Something was off in the room, and she wasn't sure what. The plain wood panel walls had been stained, but she couldn't identify the precise shade. Oak? No, the color wasn't dark enough. Pine? Maybe, but the shade wasn't either light or dark pine, but somewhere in between.
The way the light played off the walls from the windows in the upper right part of the room didn't help her, either. The wind through foliage played tricks with the shadows fluttering across the wood, making it so she couldn't pinpoint how big the room really was. Was it claustrophobic or too big?
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For describing a character, I do the same sort of thing.
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Jule stepped out of line, giving her former mentor, now boss, a happy smile. "Hey, Rik!" If anyone reminded her of a Bantam rooster, like the ones her grandmother raised, it was Rik. He was short with a round torso and a bit of a pot belly perched on skinny little legs, and he was topped with a shock of wild black and gray hair. But he radiated an intense, focused energy that drove people to do their best for him. She wished she could have just a bit of that ability.
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Basically, people notice what they are trained to notice. Most people, you stick them in a living room and they'll see couch, chairs, endtables, lamp, and tv. They'll barely register the pictures on the wall, much less be able to tell you who is in what picture or which picture is hanging where.
In my examples, Jule is a forensic archeologist who is constantly looking at things to observe them. But she doesn't always draw the correct conclusions from her observation. That makes her an unknowingly unreliable narrator, but that's ok. It's her story, after all.
Good luck!