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You can use the command for tables. Instead of text you enter pictures
as bellow:
 
![picture](address) | ![picture](address) | ![picture](address)
--- | --- | ---

visual:
Thubnails.png
 

Note: you can link every picture with a picture in original size or with an external link.
Cheers!

thx for quick response - i mean more in terms of Thumbnail perfectly made to show it on steemit.com page. Some pics seem to not have the perfecet this for the thumbnail and important parts are cut off.

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