You can try and set image to public.

Or...

Here is a trick. What app do you use?

I use iris.to

I usually upload my image as a note on iris.to then right click > copy link addrees and post it in the image section

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Thank you so much! I just logged in on Iris.to and uploaded a shadowy super ostrich with laser eyes there haha

Nice. Iris.to is super easy @npub1wnwwcv0a8wx0m9stck34ajlwhzuua68ts8mw3kjvspn42dcfyjxs4n95l8