Two posts not showing featured images?

I found that there are two posts on my site that are not showing the featured image:

https://travelstoriesandimages.com/travel-related-book-recommendations/
https://travelstoriesandimages.com/top-five-luxury-hotels-in-bogota/

(I can see that in this post the featured images display – but if you click through to my blog and bring up the individual post, you’ll see that they’re not at the top of the page).

I thought this might have something to do with the featured images being too small. I added larger featured images into each of these posts, but when I saved the post and looked at it again, it still doesn’t show the featured images on the top.

Are there specific guidelines or dimensions I should follow for a featured image?

• This topic was modified 5 years by  jtj3.
• This topic was modified 5 years by  jtj3.