i think the problem is the size of the image, or your using the wrong link
photobucket will resize an image if it is over a particular size in bytes, and the right link to use is the image code, or click on the pick at p-buck then click on the pick that comes up again to get the full size, right click that then hit properties, you`ll see a web address, paste that into your message highlight it and then hit the image button at the top of the reply window.
i went to the image and zoomed in, it is a decent res image
cheers
troppo