The key is perception and observation.Many people see or experience the same thing, but describe it differently.
For example, what did you see when you walked into the classroom this morning?

a classroom filled with students loose tiles long thick curtains formica -topped desks silent TV set hum of the air conditioner talkative students

(very GENERAL) (SPECIFIC things)

Incorporate these things into your writing. (You don’t have to use them all.)
As Jill trudged into the classroom this morning, panting after her long climb up the 35 step staircase, she sensed a feeling of excitement in the air. The eager students were chatting noisily above the steady hum of the air conditioner. One young man had drawn back the thick curtains and was watching the activity in the street below. Another was taking aim at the unsuspecting student’s right ear with a paper airplane. The teacher was nowhere in sight.

Don’t ignore details, capture them.

Remember the five senses: (external observations) see hear smell touch taste

Also: (internal) thoughts feelings actions

SHOW the reader, don’t just tell him/her.

SPECIFIC is terrific.

VERBS

1. He walked into the room.

tiptoed , stomped, sauntered, crept, rushed, waltzed

2. The girls talked.

chatted noisily, whispered, conversed, shouted

NOUNS

Pay attention to specific parts rather than overuse adjectives.

1. The young woman was beautiful.

Her eyes sparkled in the moonlight.

Her hair . . .

2. The watch indicated the time.

The second hand ticked away slowly as the electronic buzzer announced one o’clock .