There is no right answer to this question, as it depends on the individual blog and its readership. Some bloggers may feel that pictures detract from the overall readability and quality of their posts, while others may believe that including photos adds an interesting dimension to their writing.
Ultimately, it is up to each individual blogger to decide whether or not photos are necessary for their content.
As a general rule of thumb, however, it is generally advisable to include some picture content when writing a blog post. Not only does this improve the reader experience, but it also helps to attract more viewers and followers to your website.
If your blog is focused on providing valuable information and insights, then including photos will definitely help to distinguish yourself from your competitors.