[Jeff Head]

Put double quotes around the URL and your image will work.

On the earlier one, you had two back slashes at the end of the URL and only needed one. You also need double quotes around the URL in that one too.

[ThePythonicCow]

Put double quotes around the URL

These are not usually needed; only if certain unusual characters are in the URL would I suppose they were needed.

I always leave them out of my image posts, due to laziness.

I always leave them out of instructions to others leaning to post images, to remove one more detail they don't need.