Ok, I may have mispoken.
The markdown image syntax doesnt live within chunks but outside of chunks the same as normal document text. Here is a complete example you can copy into a blank script, and preview/knit.
Also please do not use screenshots to communicate when the information you have is textual and can be copy pasted and formatted for the forum. Share code like I do in this example. triple backticks just like in markdown, apply a code format on these forum posts (when sharing markdown codes use quadruple backticks !)
---
title: "example of images in rmarkdown"
output: html_notebook
---
This is some text in the document
next will be the image:

now an R code chunk
```{r}
1+2
```
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