Currently my blog have "Text & image/Rich media" type add unite under the blog post title. If i change it ad type as "Image only add" or "image & Rich media add" is good thing? It can generate higher "clicks"? Is it violate Adsense TOS?
Text adds are much better because you can show more adds in text and on the other side if you choose image adds then it will display only one add on a single time.
use both - its a blog so text would work well with the information aspect: your site visitors come to your site to read about stuff right, so the text links will relate to what they're reading about and it'll have a variety of relevant links to choose from. Image ads grab their attention, you want that too - it gets them curious.. and click, click, click, they want to know what's on the other end. Stick with both.
Good content to view the percentage of people above, do not be put to people that we click or follow the content, money will automatically come to you