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.
Remember that content is the key to a successful blog. Quality scores over quantity in getting audience to your blog.
Tags: Use of relevant tags is important from the SEO perspective. It helps the search engine track your post based on the tags you use.