Another way is upload pictures to Google photos.
Then share to anyone with a link, I dont know if not sharing the picture wont display.
I have albums (collections) of pictures, and I just share the whole collection. Only have to do that one time.
When looking at the picture in the google photos, right click and select copy picture address.
Then to post the picture, click the yellow symbol with mountain and moon. It will open a box, and you paste in the picture link.
Here I am hauling out my motor.
This will work with most any photo web site where you store pictures.