Presentation is as important as good content. Have attractive pictures, fonts, etc. on your blog to hook the reader.
Series of articles - Create a series of articles on your blog if the subject you choose to talk about is an extensive one.
Image speak - A lot of bloggers tend to ignore this, but the images on your blog speak a lot for what you write. Use good quality images and make sure they express your written stuff in utmost simplicity yet precision.