Appreciated.
<img src=https://upload.wikimedia.org/wikipedia/commons/thumb/7/7b/MtRushmore.jpg/1200px-MtRushmore.jpg>
Posts:
Control the size with the width=nnn command:
<img src=https://upload.wikimedia.org/wikipedia/commons/thumb/7/7b/MtRushmore.jpg/1200px-MtRushmore.jpg width=700>
Like so: