In blogging your articles or blog content is one of the most important thing to be successful. The very first thing in making an article for you blog is originality, you should take time in writing and not just copying articles form other blogs, doing this is not considered blogging and you can never call yourself a blogger. Original authors of good articles take hours in writing their contents. Number one reason why you should make original content is you can never get visitors to your blog, specially from search engines because google, yahoo and other search engines filter and pick only the original contents and shown in search results. For short copied articles are useless.
Let's proceed to our topic, a good article should have enough words and not just a single sentence or two. make it at least 3 or more long paragraphs. Doing this will make it worth reading for readers and a long article will contribute in your blog's SEO in terms of keywords (for short it will also make your blog rank higher in search engine results), I will explain this further in later articles.
Your article should also have at least one photo. Adding image also make your article attractive, by the way in adding images it is always recommended to post your own photo and if the image is not yours you should always give credits to the real owner.