If you want to add more pictures to your workshop item just look for 'Add/Edit Images & Video' under 'Owner Controls' on the page for the item.

Ok will try that thank you !

Well I see the main pictures to add but it is the small one to the far right that shows up in the workshop searches; dont know how to add that one...

Originally posted by Moonraker:

Ok will try that thank you !

Well I see the main pictures to add but it is the small one to the far right that shows up in the workshop searches; dont know how to add that one...

The picture on the right is the jpeg found with the packed files in the addonpacks folder.

For example the workshop item 'Helmet Light Replacement' would be found here after subscribing to it: <Drive>:\Steam\userdata\<Steam ID>\244030\local\addonpacks

helmetlight_replacement_76561197972323340.info - Steam Workshop ID
helmetlight_replacement_76561197972323340.pak - Mod/Addon packed up
helmetlight_replacement_76561197972323340.jpg - Image shown on workshop page to the right

So if you want to change the main image for your workshop item, I believe you'd have to change the .jpg found in the location I showed above with another image. Then you'd upload your mod (in-game) to the workshop so it overwrites the current one.

You'll need to be careful though as you might need to match the resolution or size of the previous jpg so it shows correctly in steam.

You may also need your photo in a RAW format, meaning you just pasted a screenshot into photoshop or gimp and then save it as something else. Instead of opening a .jpg or other photo format and saving that after editing it.
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I've never changed the main image myself since I've already had the one I wanted picked out. But I certainly would try doing what I stated if I wanted to try changing it.

Tried everything changed it to png, resized, same size as default...nothing...even copied one of the other pictures that works for another mod that didnt work either. Got the other updated Mod pictures uploaded; just not mine.

The Mod picture is up now ... maybe it needs a day to upload it.