Instead of the img tag [ img ], add in size parameters like [ img width=500 ]
^remove the spaces of course.
I use this method for all image posts so that they are uniform.
If you were to quote this post, you would see this in action on the Modify Message screen. Like with this picture of Birth (defects), also from last night.
Edit; I dig this one because Birth (defects) singer reposted this today (crediting me of course) but he turned it black and white (which I should have... It is their visual aesthetic)