Make sure you had added the picture while you made new post because it also help visitor to understand the topic.do not write for your self.write your post in such a way that is easy to understand for other.It build trust for your website.
why to add related post
It is not increase you page view but also make you website user friendly.they can see what is related to the topic and might be useful and can help them.you can also add random post widget that is very amazing that show three post with round thumbnail.
How to add related post in blogger
First of all login to your blogger account and go to your blog
Go to template and edit HTML
Click inside and press ctrl+f then a search box appear
Search for
above </head> paste the give code
Find this