Basically everything Cyrille said, add more details but don't over do it. A good way to add in detail realistically is to take ideas from real life. This is awesome for scents, tastes, sights, sounds. For example, think of a nice day you might of had at the beach or with a friend at a sleepover or something? What did you do? Was there a breeze? What were you wearing? What did the air smell like? How did you feel? Try to dig into the mind of your character(s), what are they thinking about or how would they respond to certain things differently than others. Just remember not to go overboard and write incredibly long run on sentences that ending making no sense.
Good luck with your writing
