...either of these snippets:
<img src="https://s.hdnux.com/photos/0/0/0/18493110/3/2880x0.jpg" width=500>
<img src="https://s.hdnux.com/photos/0/0/0/18493110/3/2880x0.jpg" width=80%>
(View this post on its own; if viewing the whole thread including your humongo-pic, your browser viewport will be set to humongo-wide -- and 80% of that will be pretty humongous too.)
<img src="https://s.hdnux.com/photos/0/0/0/18493110/3/2880x0.jpg" width=500>
<img src="https://s.hdnux.com/photos/0/0/0/18493110/3/2880x0.jpg" width=80%>
(View this post on its own; if viewing the whole thread including your humongo-pic, your browser viewport will be set to humongo-wide -- and 80% of that will be pretty humongous too.)