Hm... Well, I don't find anything too obtrusive with this story. It's pacing is very much rushed, and you'll need to describe the scene more. The technical parts of the story seem fine, at least.

4906265 Hmm... have hard time with bg details :/

4906412
It takes some practice, yeah.

Just make sure to play off the five senses. Pretend that you're there. Pretend that you are standing right next to the action, seeing everything take place. Describe the scene as you would see it yourself.

In order of importance:

Sight:

How bright is it here? How dark? What color is the most prevalent in the scene? What size are any objects?

If you're in a bright forest, describe the green tint the surroundings would have, as well as the dappled shadows the trees cast.

Touch:

How warm is it? Is it cold? Is there some kind of latent energy in the air that makes the hair on your arms stand up?

Hearing:

What does it sound like here? Is there some kind of commotion going on? Maybe there's a crowd that's making a loud rabble.

Smell:

Really only useful if there's something odd about the situation. Maybe there's a foul smell in the air, or maybe the room smells like warm apple pie? If there's something around that would make an odor, describe the odor it's making. In the prologue, I would think that the auction would smell bad, because of the sweaty dirty bodies all crowded together.

Taste:

Even more exclusive than smell. Only really useful if a character is eating something, or if the smell in the air is so oppressive that you can literally taste it.

As an example:

"The bright emerald leaves swished merrily in a gentle warm breeze. Sun rays peeked through the gaps in the shade, painting the forest floor a golden hue. The sweet fragrance of springtime flowers drifted on the breeze, tickling the nose of anyone around to smell it."

Also, keep in mind what consequences certain actions would have. If your character has chains attached to them, moving would make a clinking noise. Snapping those chains would send small pieces of metal clattering all over the place.

Take into account the tone of the story. If the scene is meant to convey a dark or oppressive atmosphere, use dark or oppressive words. If the scene is bright and cheery, use playful happy words.

Using that same scene from before, I'll change up the wording to make it feel more bleak and empty:

"The pale green leaves blew in the wind. The hot rays of the sun crept through them, casting a surly tawny light onto the dry undergrowth. A brief whiff of flowery perfume carried itself on the wind, gone before more than a fleeting awareness of it could be had."

Use a thesaurus. They are the best friend any writer can have, even professional writers use them.

4906558 TY