Well, it's good that you type fast. But don't do it in your writings, because mistakes will lower your repatation among readers.


Respect!

With referring to the primary question 'what is personal writing style', I am not a man who could gave any encyclopedic answer to that, but I think that the trend to be uniform with the main stream is increasing and have strengthened during the last decade, the TV, the Mobil phone and, all that communications around us all the time to contribute our writing and speaking to be similar with the all other. 
The language seems becomes more and more poisoned with worn and transparent words and with the saying and with those drab phrase that the native speaker use, first among the youth, then elder folk - the English is fast expanding language and almost everyone who listen it try to imitate the way to speak of native and with the words of the native, That all right, but there must be the point to where individual makes his own way to speak and write.
Every native speaker in every country could find sometime a foreigner speaking very much better and expressive language as the native usually use.
Hemmingway had the style very plain and there could be find also sound of an accent of foreigner, the same thing is in the short story, ‘Karain Memory,by Conrad.
The typos and misspelling  you can clear and correct, more important is find the way of your own.