Method 1
Add this code on your website anywhere you want:
<iframe src="https://foodpaintings.com/random-food-painting/" style="border:1px #000000 solid;" name="Food Paintings" scrolling="yes" frameborder="1" marginheight="0px" marginwidth="0px" height="600px" width="400px"></iframe>
You can change height, width and other parameters as you wish.
Sample:
Method 2
Use this wordpress plugin:
RSS Feed Widget
Add this rss feed in the settings of plugin:
https://foodpaintings.com/?feed=rss
Set “Sort Order” to: Random
Sample website using this method in sidebar:
Sibita Blog