Hey old timer,
Here's an image I am hosting on postimages.org :
It seems pretty straightforward to use. Just upload a pic to the site, (like this screenshot I took of me uploading the above image), then select the DIRECT LINK option that I have emphasized and paste that into your journal.
Seems to work well enough, can't guarantee longevity as I haven't read about the hosting terms but these things aren't really a big deal as far as hosting is concerned, usually.