Design your blog should be consistent to make a professional impression. A blog should have a lot of text with a lot of keywords. e.g. if you are a web designer you should note that many words like cheap website, build webpage, quickly create webpage, design website etc. are included in the text. But if you are a photographer the following words are important: professional photos, fast and cheap photos, photo shooting, 4 pass pictures from 29 eur... so not so complicated :)