@snood,
The pixels are way too big - click on the photo (I don't know how to do it with a pc) and you'll see the pixels listed at the top as 1,920 x 1,080. They should be more like width=900 height=450 to fit the answer space.
I used to be able to fix that by doing this -
but in the last few weeks that has stopped working for me.
Maybe wherever you had the photo placed (photobucket, etc.) there is a way to downsize it. Or, if you picked it from google images, look for a mamba with smaller pixels..
edit - Hah, it worked!!
To see how I did it, go to the bottom of the page and click on Blog. That's were Craven wrote up a lot of how-to stuff. This how-to is in the Sept 2008 blog, about 1/2 way down the page, a paragraph about bbc code.