A writing style is rather hard to develop and rather difficult to make your own but in concept its pretty basic. It's basically a set of rules you give yourself for your writing along with any little quirks that you just naturally do. While I can't list off quirks I just naturally do I can give you a solid example of writing rules that I follow to give my writing a bit of a unique flair. Though I will not say all of them as someone may try to steal my style

1. Always write in the first person perspective. It gives the story a more personal feel.

2. When actions have the option of being singular or plural. Ex. Cuddle up with you or Cuddles up to you. Use singular as it is simpler and more decisive.

3. Sarcasm is good for jokes but I must make sure it clear. Unclear sarcasm is the devil.

I have many more rules which are inside my head but you can see where this is going. Just some simple rules that make your writing different than everyone else's writing. They often are simple and advice people often give but when combined all together they make your style of writing. And they can be quite beautiful when you look at them that way.