You also need to specify the size, so the huge image is readable
This was an example from grantmeaname.
[img width=300]http://kompute.info/annavinn/wp-content/uploads/2015/08/rsz_img_79092.jpg[/img]
you can also do specify the width
[img height=400 width=600]http://kompute.info/annavinn/wp-content/uploads/2015/08/rsz_img_79092.jpg[/img]