[maxenric]

Go to Skin Settings > Add-ons > Artwork Downloader > Download Presets - TV Shows > Click the Clear Logo button and wait for the script to finish.
This should add all clear logos for the tv shows to your library.
You can do this with clear art as well if you wish.

http://kodi.wiki/view/Add-on:Rapier#Miss...ome_screen

Let me know if it helps.  

Still the same. It downloaded the logos/ art but no difference


https://pastebin.com/p3CAmGyc 

You can try reloading the skin or restarting Kodi. That could display the missing artwork.

If that doesn't work, try updating the Next Aired addon database.
You do that by starting the addon. In the tv shows submenu, press the "Guide" button and wait for the window to open. Go to the top menubar and click the "Update" button.

Also, check your settings for artwork downloader. Do you store artwork locally or add them to the database? 

Tried all the steps mentioned. Nothing works. Artwork is stored locally.
The tv guide looks like this. Do you require logo.jpg to be of a specific size.

https://imgur.com/a/YJwSW