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I've not read your story's so I can't give you a direct advice but in general:
Try to keep up with good gramma, spelling and punctuation - it makes the story more readable. A lack of good writing makes it a pain to read, no matter how good the storyline might be.
Also, keep things in the past tense. Some people write in the present tense which usually makes things a pain to read also.
If your writing is good, then you've got to try and keep it interesting.
Keep enough descriptions to help them visualise but not so many as to leave them bored.
And focus on originality - nobody's going to care about a story if they've heard it all before.
I think that's the best I can give you for now.
It's very hard to get things right, but keep trying and practice makes perfect. :-)