I suggest that instead of hotlinking to an image, you rather upload the image and then attach it to the post. You can also put in where you want in the post, if you need it to appear in a specific place.
Many sites don't like it if you hotlink to them, and we also wouldn't have control over it if they decide to change their layout or remove the pictures.
Of course, we also ask that you respect various copyrights, where applicable. That way none of us would get dragged into a big lawsuit.