There are various techniques to improve the English writing skills in modern times. The aspiring writer can take free writing skill test on the internet to test the quality of his writings and take needed feedbacks. Make an analysis to find out the core areas where practice is required to sort out the issues. While writing content it is essential to arrange the points in proper sequence. If the matter gets scattered it will look disorganized and leave poor impression. Enrich the vocabulary stocks to avail enough flow of words to avoid repetition of same words over and again. Read books, newspapers, magazines etc. to gain enough knowledge and understanding of the present writing style.
Practice writing small articles on wide range of topics and follow the writing patterns on the famous blogging and article sites. After articulating every single piece of writing revise it to check if there are some vital points left out. On should write the things in proper sequence. If the articles point to a certain series of incidents then the chronology has to be strictly followed. Unnecessary elaboration always makes the article boring. Do make it short yet focus on the core areas. Omission of facts is not good for leaving impression. Talk in English to habituate in taking up the language.
Aditya, you have given good advise to the people who really want to improve as article writers and whose first language is not English. It is very important that one must have good vocabulary and so that one can use proper words every time. However, I personally feel that one must be careful to avoid using some very unusual words which may be perfect for the contents but makes it difficult for the reader to understand especially if the reader has limited vocabulary. These would make the reader to loose interest in your articles.
One more thing I liked which you have pointed out is that writer should avoid giving unnecessary explanations and at the same time care should be taken not to omit some important information which may cause the article to loose the basic purpose. Good work…please keep it up.