I think it might be bc of the url. I suggest instead of pasting the exact image address save the image to ur laptop (or whatever device u r using) then go to a website that makes a url code for u ( I use imgBB bc its the easiest for me but u can use anything) and that website basically hosts the link for u bc sometimes the link u use gets blocked or if the original owner of the image deletes it it won't show up for u so by using a hosting site like imgBB u can guarantee that whatever image u r using (gif or blinkie or whatever) won't break. also, if u r gonna use imgBB after u upload the image u should choose the embed code html full linked then it should give u something like this:
<a href="https://ibb.co/Q1gfpGr"><img src="THE LINK TO UR IMAGE" alt="2bcf6e13dfc070b8b47f813c37d451f8" border="0"></a>
Just copy the link and u dont need the rest of the code and that's it. u can use it in any way u want. I personally use this code for gifs and blinkies and images:
<img src="THE LINK TO UR IMAGE"/>
I hope this made some sense and pls ignore any spelling mistakes I didn't proof read this and I'm currently sleep deprived :,|