Give details and specifics

Say (or ask) what's happening. Who's doing what? Where is everyone relative to each other? What can the characters see, hear, and sense?

Again, focus on what matters. In a social situation, focus on people: who's there, how they look, how they're acting. If they're exploring a ruin, focus on the environment. In an action scene, focus on the terrain and the combatants, their position, and their momentum.

Include the occasional non-essential detail. In a social scene, mention how the food tastes or how the room feels. In a fight scene, throw in a smell or something that an enemy is wearing. This sort of extra detail can add real texture to the situation.

Use maps, props, and comparisons to convey space and relationships. Sketch the room. Use tokens or meeples. Refer to real-world spaces ("He's about where Bob is, relative to you."). Similes and metaphors are your friends!